If 20 liters of chemical X are added to 80 liters of a mixture that is 15% chemical X and 85% chemical Y, then what percentage of the resulting mixture is chemical X?  Choose the correct answer:
A) 30%
B) 32%
C) 35%
D) 38%
E) 40%
The amount of chemical X in the solution is 20 +0.15(80) = 32 liters.   32 liters / 100 liters = 32%   The answer is 32%.
<result>B</result>
If 20 liters of chemical X are added to 80 liters of a mixture that is 15% chemical X and 85% chemical Y, then what percentage of the resulting mixture is chemical X?