Solve the Problem $4 \%$ Silver Iodide Solution Must Be Mixed with A

Multiple Choice

Solve the problem.
-In a chemistry class, 6 liters of a $4 \%$ silver iodide solution must be mixed with a $10 \%$ solution to get a $6 \%$ solution. How many liters of the $10 \%$ solution are needed?

A) $4.0 \mathrm {~L}$
B) $3.0 \mathrm {~L}$
C) $2.0 \mathrm {~L}$
D) $6.0 \mathrm {~L}$