Homework Help: Math

Posted by Mani on Sunday, November 18, 2012 at 3:32am.

In 500cmcube of alcohol solution the percentage of alcohol by volume is 80%. Find the volume of water that must be added to the solution so that the ratio of the volume of alcohol to that of water becomes 5:2?
Please some one give me answer

Math - Steve, Sunday, November 18, 2012 at 4:42am
working with the amount of alcohol, which remains unchanged,

.80 * 500 = 5/7 (500+x)
x = 60

check:
in 560 ml, there are 400ml alcohol, 160 ml of water

400:160 = 5:2

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