Solve the Problem $10 \%$ Alcohol Solution Must Be Mixed with 60 Liters of A Alcohol

Multiple Choice

Solve the problem.
-How many liters of a $10 \%$ alcohol solution must be mixed with 60 liters of a $70 \%$ solution to get a $60 \%$ solution?

A) $12 \mathrm{~L}$
B) $72 \mathrm{~L}$
C) $7.2 \mathrm{~L}$
D) $1.2 \mathrm{~L}$