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標題:
s.3 percentage
發問:
Sammy mixed alcohol and water in the ratio of4:1. After a while, 15% of the alcohol in the mixture evaporated. If 30% of the original volume of water is added into the mixture,Q. Find the ratio of the volumes of the alcohol to water in the new mixture.P.S. I WANT OT KNOW WHY THE ANSWER IS NOT 3.4:1.3?
最佳解答:
alcohol water 4 1 After a while 3.4 1 If 30% of the original volume of water is added into the mixture, 3.4 1.3 Answer: alcohol to water =34 : 13 2011-01-21 20:31:02 補充： THE ANSWER IS 3.4:1.3 2011-01-23 17:32:23 補充： P.S. I WANT OT KNOW WHY THE ANSWER IS NOT 3.4:1.3? Because you got the wrong question .
Let the volumes of alcohol and water be 4k and k respectively(k is not equal to 0). So, the volume of mixture = 4k+k = 5k original: alcohol: 4k water: k after evaporation: alcohol: 3.4k water: k after addition of water: alcohol: 3.4k water: 1.3k or alcohol: 3.4k water: k+(5k*30%) = 2.5k 2011-01-21 21:47:54 補充： So, the new ratio = 3.4:1.3 or 3.4:2.5 PS: The meaning of "If 30% of the original volume of water" is arguable. It can be 30% of the original volume of water = k*30% or 30% of the original volume = 5k*30% PPS: What is the answer of the question? 2011-01-23 22:22:07 補充： To MOKKa Ho: I think 3.4:1.3 is not appropriate as non-integer is not accepted. 34:13 may be better.|||||85:520??????? 2011-01-22 12:59:39 補充： Capacity of water:x New capacity of water:x(1+30%)=1.3x Capacity of alcohol:4x New capacity of alcohol:4x(1-15%)=3.4x _________________ Ratio of them: 1.3x/3.4x 13/34(13.34) _______________________ The above answer is wrong because I do not have calculator and I get wrong the meaning.
s.3 percentage
發問:
Sammy mixed alcohol and water in the ratio of4:1. After a while, 15% of the alcohol in the mixture evaporated. If 30% of the original volume of water is added into the mixture,Q. Find the ratio of the volumes of the alcohol to water in the new mixture.P.S. I WANT OT KNOW WHY THE ANSWER IS NOT 3.4:1.3?
最佳解答:
alcohol water 4 1 After a while 3.4 1 If 30% of the original volume of water is added into the mixture, 3.4 1.3 Answer: alcohol to water =34 : 13 2011-01-21 20:31:02 補充： THE ANSWER IS 3.4:1.3 2011-01-23 17:32:23 補充： P.S. I WANT OT KNOW WHY THE ANSWER IS NOT 3.4:1.3? Because you got the wrong question .
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其他解答:Let the volumes of alcohol and water be 4k and k respectively(k is not equal to 0). So, the volume of mixture = 4k+k = 5k original: alcohol: 4k water: k after evaporation: alcohol: 3.4k water: k after addition of water: alcohol: 3.4k water: 1.3k or alcohol: 3.4k water: k+(5k*30%) = 2.5k 2011-01-21 21:47:54 補充： So, the new ratio = 3.4:1.3 or 3.4:2.5 PS: The meaning of "If 30% of the original volume of water" is arguable. It can be 30% of the original volume of water = k*30% or 30% of the original volume = 5k*30% PPS: What is the answer of the question? 2011-01-23 22:22:07 補充： To MOKKa Ho: I think 3.4:1.3 is not appropriate as non-integer is not accepted. 34:13 may be better.|||||85:520??????? 2011-01-22 12:59:39 補充： Capacity of water:x New capacity of water:x(1+30%)=1.3x Capacity of alcohol:4x New capacity of alcohol:4x(1-15%)=3.4x _________________ Ratio of them: 1.3x/3.4x 13/34(13.34) _______________________ The above answer is wrong because I do not have calculator and I get wrong the meaning.
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