Solve the Problem $\$ 0.17$ Per Pound by Mixing One Kind Worth

Multiple Choice

Solve the problem.
-Tim and Judy mix two kinds of feed for pedigreed dogs. They wish to make 21 pounds of feed worth $\$ 0.17$ per pound by mixing one kind worth $\$ 0.11$ per pound with another worth $\$ 0.22$ per pound. How many pounds of the cheaper kind should they use in the mix? Round to the nearest whole pound if necessary.

A) 10 pounds
B) 12 pounds
C) 16 pounds
D) 11 pounds