7 liters of a 22 percent solution of alcohol in water are mixed with 3 liters of an 11 percent alcohol in water solution. What is the percentage of alcohol in the new solution?	Options.
A) 17.5%
B) 17.8%
C) 18.1%
D) 18.4%
E) 18.7%
The total amount of alcohol is 0.22(7) + 0.11(3) = 1.87 liters.   The percentage is 1.87 / 10 = 18.7 / 100 which is 18.7%   The answer is 18.7%.
<result>E</result>
7 liters of a 22 percent solution of alcohol in water are mixed with 3 liters of an 11 percent alcohol in water solution. What is the percentage of alcohol in the new solution?