Math(s) problem - puzzle
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My teacher asked me to write a program on the board and solve it. I wrote:
230 - 220 x 0.5
and announced that the answer was 5! My teacher claimed I was incorrect, but I was not. Can you please explain it to him? Thanks Hint: My teacher was quite embarrassed when I actually said the answer out loud.
Brent
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I think it was meant as a riddle rather than something that actually happened.
Robust Services Core | Software Techniques for Lemmings | Articles
The fox knows many things, but the hedgehog knows one big thing. -
My teacher asked me to write a program on the board and solve it. I wrote:
230 - 220 x 0.5
and announced that the answer was 5! My teacher claimed I was incorrect, but I was not. Can you please explain it to him? Thanks Hint: My teacher was quite embarrassed when I actually said the answer out loud.
Brent
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I think it was meant as a riddle rather than something that actually happened.
Robust Services Core | Software Techniques for Lemmings | Articles
The fox knows many things, but the hedgehog knows one big thing. -
My teacher asked me to write a program on the board and solve it. I wrote:
230 - 220 x 0.5
and announced that the answer was 5! My teacher claimed I was incorrect, but I was not. Can you please explain it to him? Thanks Hint: My teacher was quite embarrassed when I actually said the answer out loud.
Brent
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dbrenth wrote:
Can you please explain it to him?
Dear Teacher, dbrenth is a cocky little so and so, who needs to be taken down a peg or two. ;P
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You teacher was right, and told you the correct result was actually
76. Could you please tell us why?"In testa che avete, Signor di Ceprano?" -- Rigoletto
I thought the answer was 78.
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I thought the answer was 78.
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Sometimes I'm just being a little bit too literal. Daniel's answer above suggests we're both on the same page on this one. :-)
Yeah, you're both on the AR page. :-D
Robust Services Core | Software Techniques for Lemmings | Articles
The fox knows many things, but the hedgehog knows one big thing. -
You teacher was right, and told you the correct result was actually
76. Could you please tell us why?"In testa che avete, Signor di Ceprano?" -- Rigoletto
Octal
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows. -- 6079 Smith W.
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Octal
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows. -- 6079 Smith W.
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You are wrong, the teacher is right. The order of precedence in mathematical operations is (mnemonic PEMDAS): Parentheses Exponentiation Multiplication & Division Addition & Subtraction If two operations have the same precedence, they are evaluated from left to right. Your problem may be rewritten as 230 - (220 x 0.5), the answer to which is obviously not 5.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows. -- 6079 Smith W.
3! - 1 I think you'll find :) It's curious - nearly everyone I know was taught BODMAS - its the same as PEDMAS, but B=Brackets, O="of". PEDMAS is probably better. Also the great Indian chief "SOH-CAH-TOA". I wonder if they still teach the latter in schools.
KeithBarrow.net[^] - It might not be very good, but at least it is free!
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My teacher asked me to write a program on the board and solve it. I wrote:
230 - 220 x 0.5
and announced that the answer was 5! My teacher claimed I was incorrect, but I was not. Can you please explain it to him? Thanks Hint: My teacher was quite embarrassed when I actually said the answer out loud.
Brent
If you solve it left-to-right, ignoring precedence order, then the answer is 5. An old TI calculator would give you that answer. Today's windows calculator will not: it says 120 because the multiplication is done first.
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
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Yeah, you're both on the AR page. :-D
Robust Services Core | Software Techniques for Lemmings | Articles
The fox knows many things, but the hedgehog knows one big thing. -
My teacher asked me to write a program on the board and solve it. I wrote:
230 - 220 x 0.5
and announced that the answer was 5! My teacher claimed I was incorrect, but I was not. Can you please explain it to him? Thanks Hint: My teacher was quite embarrassed when I actually said the answer out loud.
Brent
And today you learn that nobody likes a smartarse ... :laugh:
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony "Common sense is so rare these days, it should be classified as a super power" - Random T-shirt AntiTwitter: @DalekDave is now a follower!
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And today you learn that nobody likes a smartarse ... :laugh:
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony "Common sense is so rare these days, it should be classified as a super power" - Random T-shirt AntiTwitter: @DalekDave is now a follower!
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My teacher asked me to write a program on the board and solve it. I wrote:
230 - 220 x 0.5
and announced that the answer was 5! My teacher claimed I was incorrect, but I was not. Can you please explain it to him? Thanks Hint: My teacher was quite embarrassed when I actually said the answer out loud.
Brent
Very clever :thumbsup:
cheers Chris Maunder
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3! - 1 I think you'll find :) It's curious - nearly everyone I know was taught BODMAS - its the same as PEDMAS, but B=Brackets, O="of". PEDMAS is probably better. Also the great Indian chief "SOH-CAH-TOA". I wonder if they still teach the latter in schools.
KeithBarrow.net[^] - It might not be very good, but at least it is free!
