OG PS-196

[mimichu]

The ratio, by volume, of soap to alcohol to water in a certain solution is 2:50:100. The solution will be altered so that the ratio of soap to alcohol is doubled while the ratio of soap to water is halved. If the altered solution will contain 100 cubic centimeters of alcohol, how many cubic centimeters of water will it contain?
A. 50
B. 200
C. 400
D. 625
E. 800

ANS E 題目有點看不同所以不會算 請指導

[Huang Hsin-Yi]

原本s:a:w=2:50:100
然後混和水改變了,比例也會不同
當s:a比例 是原來的兩倍時 s:w的比例卻只剩下一半
假如改變後的混合水 alcohol 是100 問 water是多少?

這樣你再試試會不會