6 pints of a 20 percent solution of alcohol in water are mixed with 4 pints of a 10 percent alcohol in water solution. The percentage alcohol in the new solution is
A. 16
B. 15
C. 14
D. 13
E. 12
If a 6 pint solution is 20% alcohol, then how much alcohol does it contain? Simple: 6 X .20, which equals 1.2 pints. Furthermore, if a 4 pint solution is 10% alcohol, then it will contain .4 pint of alcohol. Mix them together and what do we have? We have a 10 pint solution, 1.6 pints of which will be alcohol. 1.6 is 16% of 10. The answer is (A).
source: majortests.com
