Solution X is 40% chemical A and 60% chemical B by volume. Solution Y is 50% chemical A and 50% chemical B by volume. If a mixture of X and Y is 47% chemical A, what percent of the mixture is Solution X?  Choose the correct choice from the following choices.
A) 15% B) 20% C) 25% D) 30% E) 35%
The volume of the mixture be X+Y.   0.4X +0.5Y=0.47(X+Y)   X=3Y/7   X/(X+Y)=(3Y/7) / (10Y/7)=3/10=30%.   The answer is 30%.
<result>D</result>
Solution X is 40% chemical A and 60% chemical B by volume. Solution Y is 50% chemical A and 50% chemical B by volume. If a mixture of X and Y is 47% chemical A, what percent of the mixture is Solution X?