Solution X is 10% chemical A and 90% chemical B by volume. Solution Y is 20% chemical A and 80% chemical B by volume. If a mixture of X and Y is 12% chemical A, what percent of the mixture is Solution X?
Pick one
A) 80%	B) 75%	C) 70%	D) 65%	E) 60%
The volume of the mixture be X+Y.   0.1X +0.2Y=0.12(X+Y)   X=4Y   X/(X+Y)=4/5=80%.   The answer is 80%.
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Solution X is 10% chemical A and 90% chemical B by volume. Solution Y is 20% chemical A and 80% chemical B by volume. If a mixture of X and Y is 12% chemical A, what percent of the mixture is Solution X?