SOLUTION: if I have a 90% solution of ROH how do I make it a 70% solution ?

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Question 920438: if I have a 90% solution of ROH how do I make it a 70% solution ?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
water = water
.10A + x = .30(A + x)
x = .20A/.70 = (2/7)A, the amount of water to add.
......
Lets say Amount of 90% was 70Q...add 20Q water