If $\frac{40}{x}-1=19$, then $x$ is equal to
(A) -1
(B) $\frac{1}{2}$
(C) 1
(D) 2
(E) -2
Since $\frac{40}{x}-1=19$, then $\frac{40}{x}=20$.

Thus, $x=2$, since the number that we must divide 40 by to get 20 is 2 .

ANswer: (D)