Skip PCM Powercom brand units. Had a pair of 'em, both went flaky and would start beeping, switch to battery when line voltage OK. Tried contacting company about repair / replacement / upgrade; messages never acknowledged. Big APC 750 of same vintage still in service. James

Yes, p gets factored out. 5o = 3r + 2y 3g = 2b + 1y So any amount of orange is (proportion) 3/5 r and 2/5 y. Hence: o: 3r/5 + 2y/5 g: 2b/3 + 1y/3 Equal amounts o and g = o/2 + g/2 = 9r/30 + 6y/30 + 10b/30 + 5y/30 = 9r/30 + 10b/30 + 11y/30 so the proportion of yellow in any mix of equal parts orange and green is 11/30th. It's not rocket science; it's simple high school algebra. Jim