SOLUTION: How much pure alcohol should be added to 400 ml. of 15% strength to make its strength 32%?

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Question 331753: How much pure alcohol should be added to 400 ml. of 15% strength to make its strength 32%?
Answer by mathmandotcom(31) About Me  (Show Source):
You can put this solution on YOUR website!
.15(400) +1x=.32(400+x): 1=100% x=amount of prue alcohol needed
60+x=120+.32x: subtract 60 from both sides
x=60+.32x: subtract .32x from both sides
.68x=60; divide by .68
x=60/.68; simplify
x=88.235ml at least