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  3. 2 + 2 = 5 ( Silly puzzle of the Day) [SOLUTION ADDED]

2 + 2 = 5 ( Silly puzzle of the Day) [SOLUTION ADDED]

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  • R Raj Lal

    In a "Real" world, there are a lot of people, who takes 2 with 2 and make it a 5 Well the silly question is, Can a "mathematician in you" also do this ? TAKE two 2's and any number of mathematical operations AND make it EQUAL TO 5 Another question to ponder , Imagine you are standing in front of a mirror, facing it. Raise your left hand. Raise your right hand. Look at your reflection. When you raise your left hand your reflection raises what appears to be his right hand. But when you tilt your head up, your reflection does too, and does not appear to tilt his/her head down. Why is it that the mirror appears to reverse left and right, but not up and down? * there is no genius in google-dept Solution here[^]

    Omit Needless Words - Strunk, William, Jr.


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    PIEBALDconsult
    wrote on last edited by
    #18

    I really wish that only well-worded puzzles were posted. If this is from a book, please post the full, complete, exact text of the puzzle. Plus attribution would help.

    R J 3 Replies Last reply
    0
    • J Josh Smith

      Joe Q wrote:

      Use extreamly large values of 2!

      Is that like when I try to moderate my fook intake and cut a slice of pizza in half, but eat the "bigger" half? :-D

      :josh: My WPF Blog[^]
      We are what we repeatedly do. Excellence then, is not an act, but a habit. - Aristotle

      J Offline
      J Offline
      Joe Q
      wrote on last edited by
      #19

      Josh Smith wrote:

      Is that like when I try to moderate my fook intake and cut a slice of pizza in half, but eat the "bigger" half?

      No, that's helping whomever is going to eat the other half moderate their food intake...you're just being helpful! :laugh:

      J 1 Reply Last reply
      0
      • J Joe Q

        Josh Smith wrote:

        Is that like when I try to moderate my fook intake and cut a slice of pizza in half, but eat the "bigger" half?

        No, that's helping whomever is going to eat the other half moderate their food intake...you're just being helpful! :laugh:

        J Offline
        J Offline
        Josh Smith
        wrote on last edited by
        #20

        Joe Q wrote:

        you're just being helpful!

        Please explain that to my girlfriend! :laugh:

        :josh: My WPF Blog[^]
        We are what we repeatedly do. Excellence then, is not an act, but a habit. - Aristotle

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        • P PIEBALDconsult

          I really wish that only well-worded puzzles were posted. If this is from a book, please post the full, complete, exact text of the puzzle. Plus attribution would help.

          R Offline
          R Offline
          Raj Lal
          wrote on last edited by
          #21

          Two questions 1. The context is the first question or the second question ? 2. You mean the puzzle is not clear ? Can you help make it clear because thes are not from any book or text, i read that long back and thought to share

          Omit Needless Words - Strunk, William, Jr.


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          • R Raj Lal

            In a "Real" world, there are a lot of people, who takes 2 with 2 and make it a 5 Well the silly question is, Can a "mathematician in you" also do this ? TAKE two 2's and any number of mathematical operations AND make it EQUAL TO 5 Another question to ponder , Imagine you are standing in front of a mirror, facing it. Raise your left hand. Raise your right hand. Look at your reflection. When you raise your left hand your reflection raises what appears to be his right hand. But when you tilt your head up, your reflection does too, and does not appear to tilt his/her head down. Why is it that the mirror appears to reverse left and right, but not up and down? * there is no genius in google-dept Solution here[^]

            Omit Needless Words - Strunk, William, Jr.


            JumpyForum:CP Message board | Universal DBA | Ajax Rating | ExplorerTree | | Globalization in 20 minutes
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            CastorTiu
            wrote on last edited by
            #22

            When I sell something 2 + 2 = 5 When I buy something 2 + 2 = 3 more clear than that?

            -- If you think the chess rules are not fair, first beat Anand, Kasparov and Karpov then you can change them. Moral is, don't question the work of others if you don't know the reason why they did it.

            1 Reply Last reply
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            • R Raj Lal

              In a "Real" world, there are a lot of people, who takes 2 with 2 and make it a 5 Well the silly question is, Can a "mathematician in you" also do this ? TAKE two 2's and any number of mathematical operations AND make it EQUAL TO 5 Another question to ponder , Imagine you are standing in front of a mirror, facing it. Raise your left hand. Raise your right hand. Look at your reflection. When you raise your left hand your reflection raises what appears to be his right hand. But when you tilt your head up, your reflection does too, and does not appear to tilt his/her head down. Why is it that the mirror appears to reverse left and right, but not up and down? * there is no genius in google-dept Solution here[^]

              Omit Needless Words - Strunk, William, Jr.


              JumpyForum:CP Message board | Universal DBA | Ajax Rating | ExplorerTree | | Globalization in 20 minutes
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              Raj Lal
              wrote on last edited by
              #23

              Where o where ? Nish, i hope you haven't given up on silly puzzles :) -- modified at 19:06 Friday 26th January, 2007

              Omit Needless Words - Strunk, William, Jr.


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              • P PIEBALDconsult

                I really wish that only well-worded puzzles were posted. If this is from a book, please post the full, complete, exact text of the puzzle. Plus attribution would help.

                J Offline
                J Offline
                Josh Smith
                wrote on last edited by
                #24

                PIEBALDconsult wrote:

                If this is from a book, please post the full, complete, exact text of the puzzle. Plus attribution would help.

                Perhaps the International Puzzle and Gaming Committee should ratify the puzzle, too? :rolleyes:

                :josh: My WPF Blog[^]
                We are what we repeatedly do. Excellence then, is not an act, but a habit. - Aristotle

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                • J Josh Smith

                  Quartz... wrote:

                  Imagine you are standing in front of a mirror, facing it. Raise your left hand. Raise your right hand.

                  This sounds like the first chapter to "The Introverts Guide to the Hokey Pokey[^]." :-D

                  :josh: My WPF Blog[^]
                  We are what we repeatedly do. Excellence then, is not an act, but a habit. - Aristotle

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                  Raj Lal
                  wrote on last edited by
                  #25

                  Josh Smith wrote:

                  This sounds like the first chapter to "The Introverts Guide to the Hokey Pokey[^]."

                  Does it ! i have never read that, :laugh::laugh::laugh:

                  Omit Needless Words - Strunk, William, Jr.


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                  • R Raj Lal

                    Two questions 1. The context is the first question or the second question ? 2. You mean the puzzle is not clear ? Can you help make it clear because thes are not from any book or text, i read that long back and thought to share

                    Omit Needless Words - Strunk, William, Jr.


                    JumpyForum:CP Message board | Universal DBA | Ajax Rating | ExplorerTree | | Globalization in 20 minutes
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                    PIEBALDconsult
                    wrote on last edited by
                    #26

                    Quartz... wrote:

                    1. The context is the first question or the second question ?

                    Oh, yeah, sorry, the second first... the puzzle. I don't find the first second very interesting.

                    Quartz... wrote:

                    2. You mean the puzzle is not clear ? Can you help make it clear because thes are not from any book or text, i read that long back and thought to share

                    Ah, so you may have left out bits you thought non-essential? Not to get down on you in particular, but any who post puzzles on the Web in general. Plus, many times a puzzle is posted because the poster didn't find the answer, and if that's because he didn't understand the puzzle, then quite likely the resultant post will be garbled and unsolvable. As has been seen on here before. At any rate, of the solutions I've seen posted here so far only ceil(sqrt(22)) seems to qualify as a "proper" answer. The answers 5+5+1 and 2+2+2/2 don't qualify, because they break the implied limitation. If you then say "I never implied that", then the puzzle is no longer interesting, because many many solutions are then possible and a puzzle should have one or very few solutions. How about, "I am one with two plus two, that makes five"? Or, "two plus two and a banana makes five"? When I read a puzzle like that (poorly-worded) on the Web I can only assume that the poster left out such details in the interest of brevity, or not realizing the scope of the error, or because he's smoked too much weed. -- modified at 19:51 Friday 26th January, 2007

                    R 1 Reply Last reply
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                    • P PIEBALDconsult

                      Quartz... wrote:

                      1. The context is the first question or the second question ?

                      Oh, yeah, sorry, the second first... the puzzle. I don't find the first second very interesting.

                      Quartz... wrote:

                      2. You mean the puzzle is not clear ? Can you help make it clear because thes are not from any book or text, i read that long back and thought to share

                      Ah, so you may have left out bits you thought non-essential? Not to get down on you in particular, but any who post puzzles on the Web in general. Plus, many times a puzzle is posted because the poster didn't find the answer, and if that's because he didn't understand the puzzle, then quite likely the resultant post will be garbled and unsolvable. As has been seen on here before. At any rate, of the solutions I've seen posted here so far only ceil(sqrt(22)) seems to qualify as a "proper" answer. The answers 5+5+1 and 2+2+2/2 don't qualify, because they break the implied limitation. If you then say "I never implied that", then the puzzle is no longer interesting, because many many solutions are then possible and a puzzle should have one or very few solutions. How about, "I am one with two plus two, that makes five"? Or, "two plus two and a banana makes five"? When I read a puzzle like that (poorly-worded) on the Web I can only assume that the poster left out such details in the interest of brevity, or not realizing the scope of the error, or because he's smoked too much weed. -- modified at 19:51 Friday 26th January, 2007

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                      Raj Lal
                      wrote on last edited by
                      #27

                      i don't think a lot of people here agrees to that, because the question is very simple , just one line and there is no scope of misunderstanding it. i added a bit of confusion to make it difficult to understand on the first place and there is only one MATHEMATICAL ACCURATE solution to it. and i do have the solution to it

                      PIEBALDconsult wrote:

                      When I read a puzzle like that (poorly-worded) on the Web I can only assume that the poster left out such details in the interest of brevity, or not realizing the scope of the error, or because he's smoked too much weed.

                      Very interesting interpretation though

                      Omit Needless Words - Strunk, William, Jr.


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                      • R Raj Lal

                        i don't think a lot of people here agrees to that, because the question is very simple , just one line and there is no scope of misunderstanding it. i added a bit of confusion to make it difficult to understand on the first place and there is only one MATHEMATICAL ACCURATE solution to it. and i do have the solution to it

                        PIEBALDconsult wrote:

                        When I read a puzzle like that (poorly-worded) on the Web I can only assume that the poster left out such details in the interest of brevity, or not realizing the scope of the error, or because he's smoked too much weed.

                        Very interesting interpretation though

                        Omit Needless Words - Strunk, William, Jr.


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                        PIEBALDconsult
                        wrote on last edited by
                        #28

                        Quartz... wrote:

                        question is very simple

                        There are no simple questions, only simple questioners. Well, maybe I've seen too many bad puzzles posted, I'll go read it again.

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                        • R Raj Lal

                          i don't think a lot of people here agrees to that, because the question is very simple , just one line and there is no scope of misunderstanding it. i added a bit of confusion to make it difficult to understand on the first place and there is only one MATHEMATICAL ACCURATE solution to it. and i do have the solution to it

                          PIEBALDconsult wrote:

                          When I read a puzzle like that (poorly-worded) on the Web I can only assume that the poster left out such details in the interest of brevity, or not realizing the scope of the error, or because he's smoked too much weed.

                          Very interesting interpretation though

                          Omit Needless Words - Strunk, William, Jr.


                          JumpyForum:CP Message board | Universal DBA | Ajax Rating | ExplorerTree | | Globalization in 20 minutes
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                          PIEBALDconsult
                          wrote on last edited by
                          #29

                          OK, I reread it again. If indeed

                          Quartz... wrote:

                          the question is very simple , just one line and there is no scope of misunderstanding it

                          and the only question there is Can a "mathematician in you" also do this ? then, my answer is, "Yes". But that doesn't satisfy

                          Quartz... wrote:

                          there is only one MATHEMATICAL ACCURATE solution to it

                          So, perhaps the answer you seek is, "No". At any rate, ask the question without

                          Quartz... wrote:

                          added a bit of confusion to make it difficult to understand on the first place

                          because otherwise I must assume you've smoked too much weed.

                          1 Reply Last reply
                          0
                          • R Raj Lal

                            In a "Real" world, there are a lot of people, who takes 2 with 2 and make it a 5 Well the silly question is, Can a "mathematician in you" also do this ? TAKE two 2's and any number of mathematical operations AND make it EQUAL TO 5 Another question to ponder , Imagine you are standing in front of a mirror, facing it. Raise your left hand. Raise your right hand. Look at your reflection. When you raise your left hand your reflection raises what appears to be his right hand. But when you tilt your head up, your reflection does too, and does not appear to tilt his/her head down. Why is it that the mirror appears to reverse left and right, but not up and down? * there is no genius in google-dept Solution here[^]

                            Omit Needless Words - Strunk, William, Jr.


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                            szukuro
                            wrote on last edited by
                            #30

                            Math.Round(Math.Tanh(2) + Math.Sinh(2)) is 5 :)

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                            • R Raj Lal

                              In a "Real" world, there are a lot of people, who takes 2 with 2 and make it a 5 Well the silly question is, Can a "mathematician in you" also do this ? TAKE two 2's and any number of mathematical operations AND make it EQUAL TO 5 Another question to ponder , Imagine you are standing in front of a mirror, facing it. Raise your left hand. Raise your right hand. Look at your reflection. When you raise your left hand your reflection raises what appears to be his right hand. But when you tilt your head up, your reflection does too, and does not appear to tilt his/her head down. Why is it that the mirror appears to reverse left and right, but not up and down? * there is no genius in google-dept Solution here[^]

                              Omit Needless Words - Strunk, William, Jr.


                              JumpyForum:CP Message board | Universal DBA | Ajax Rating | ExplorerTree | | Globalization in 20 minutes
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                              R Offline
                              Raj Lal
                              wrote on last edited by
                              #31

                              Ist one sqrt( (.2) ^ (-2) ) [^] i can hear your "huh!" 2nd one as some of you have already guessed the mirror just reflect and our eye see the image horizontally . The reason why it appears to reverse left/right is because of the symmetry of our body. nice weekend

                              Omit Needless Words - Strunk, William, Jr.


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                              • R Rama Krishna Vavilala

                                Out of curiosity, where are all these puzzles coming from? Have you bought a book?

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                                Raj Lal
                                wrote on last edited by
                                #32

                                Solution here[^]

                                Omit Needless Words - Strunk, William, Jr.


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                                • R Rob Graham

                                  Quartz... wrote:

                                  Why is it that the mirror appears to reverse left and right, but not up and down?

                                  The mirror doesn't rotate anything. It reflects the image back without any rotation about any axis. A human observer looking at you from the mirrors location would have to rotate about his vertical axis, thus reversing his left and right from your perspective

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                                  Raj Lal
                                  wrote on last edited by
                                  #33

                                  Solution here[^]

                                  Omit Needless Words - Strunk, William, Jr.


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                                  • C Chris Losinger

                                    Quartz... wrote:

                                    But when you tilt your head up, your reflection does too, and does not appear to tilt his/her head down. Why is it that the mirror appears to reverse left and right, but not up and down?

                                    looking into a flat mirror reverses the Z axis, mentally: what points at the mirror in real life points out in the reflection. so we assume the reflection is of a person facing us, which would put his right arm on our left side, because that's true for real people facing us... but, it's not a person facing us, and it doesn't actually swap left and right. and it doesn't appear to swap up and down because we don't assume people facing us are upside down. but we do assume people facing us have their left on our right. we're just fooled by our assumptions.

                                    Quartz... wrote:

                                    2 with 2 and make it a 5

                                    no time for such foolishness. it's 5:30! time to go home!

                                    image processing toolkits | batch image processing | blogging

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                                    Raj Lal
                                    wrote on last edited by
                                    #34

                                    Solution here[^]

                                    Omit Needless Words - Strunk, William, Jr.


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                                    • E Ed Poore

                                      Can't remember the exact solution but I'm pretty sure it involves multiplying by infinity, adding something or other (because infinity + x is infinity) then cancelling out the infinities resulting in the imbalanced equation. I think anyway :scratches head:


                                      I have no idea what I just said. But my intentions were sincere.

                                      Poore Design

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                                      Raj Lal
                                      wrote on last edited by
                                      #35

                                      Solution here[^]

                                      Omit Needless Words - Strunk, William, Jr.


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                                      • J Joe Q

                                        Quartz... wrote:

                                        In a "Real" world, there are a lot of people, who takes 2 with 2 and make it a 5

                                        Use extreamly large values of 2! Joe Q

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                                        Raj Lal
                                        wrote on last edited by
                                        #36

                                        Solution here[^]

                                        Omit Needless Words - Strunk, William, Jr.


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                                        • S szukuro

                                          Math.Round(Math.Tanh(2) + Math.Sinh(2)) is 5 :)

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                                          Raj Lal
                                          wrote on last edited by
                                          #37

                                          i haven't checked that but seems to be a good solution if it is accurate Solution here[^]

                                          Omit Needless Words - Strunk, William, Jr.


                                          JumpyForum:CP Message board | Universal DBA | Ajax Rating | ExplorerTree | | Globalization in 20 minutes
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