A 40-liter solution of alcohol and water is 5 percent alcohol. If 2.5 liters of alcohol and 7.5 liters of water are added to this solution, what percent of the solution produced is alcohol?	Select the correct option: A) 9% B) 12% C) 15% D) 18% E) 21%
The percent of alcohol in the solution is (0.05(40) + 2.5) / 50 = 4.5/50 = 9%   The answer is 9%.
<result>A</result>
A 40-liter solution of alcohol and water is 5 percent alcohol. If 2.5 liters of alcohol and 7.5 liters of water are added to this solution, what percent of the solution produced is alcohol?