Explanation:

Since we are given the cost of three pounds of chicken, we can divide that cost by three to find the cost of one pound. Then we can multiply the cost of one pound by 15 to get the cost of 15 pounds.

$3$ pounds = $3.67 $\frac{3.67}{3} = 1.22 \overline{3}$$1$pound $\approx$$1.22

$1.22 \overline{3} \cdot 15 = 18.35$

$15$ pounds = \$18.35