If $2^{x}=15$ and $15^{y}=32$, the value of $x y$ is
(A) 5
(B) 8
(C) 16
(D) 6
(E) 4
Since $2^{x}=15$ and $15^{y}=32$, then $\left(2^{x}\right)^{y}=32$ or $2^{x y}=32$.

Since $2^{5}=32$, then $x y=5$.

ANSWER: (A)