The proportion of water to alcohol in Solution A is 4:1 and the proportion of water to alcohol in Solution B is 3:1. If an equal amount of each solution is mixed together, what is the concentration of alcohol in the new solution? Pick one
A) 16.5%	B) 18.5%	C) 20.5%	D) 22.5%	E) 24.5%
Let V be the total volume of the new solution.   Then a volume of V/2 was added from each solution A and B.   The amount of alcohol added to the new solution was:   (1/5)(V/2)+(1/4)(V/2)=V/10+V/8=9V/40.   The concentration of alcohol is 9/40=22.5%   The answer is 22.5%.
<result>D</result>
The proportion of water to alcohol in Solution A is 4:1 and the proportion of water to alcohol in Solution B is 3:1. If an equal amount of each solution is mixed together, what is the concentration of alcohol in the new solution?