Solve the Problem Using Matrices $\$ 1.66$ Per Pound with Candy Worth

Multiple Choice

Solve the problem using matrices.
-Ellen wishes to mix candy worth $\$ 1.66$ per pound with candy worth $\$ 7.29$ per pound to form 27 pounds of a mixture worth $\$ 5.41$ per pound. How many pounds of the more expensive candy should she use?

A) $9 \mathrm { lb }$
B) $18 \mathrm { lb }$
C) $23 \mathrm { lb }$
D) $11 \mathrm { lb }$