Question

Suppose 12 quarts of pure antifreeze is mixed with 8 quarts of a solution that is 72% antifreeze. Answer the questions below. Do not do any rounding.
(a) How many quarts of antifreeze are in the resulting mixture? quarts
(b) What percentage of the resulting mixture is antifreeze? %

Answer 1

(a)  

12+0.72(8)

12+5.76

17.76 qts of antifreeze

(b)

100(12+8(.72))/(12+8)

100(12+5.76)/20

100(17.76)/20

5(17.76)

88.8%