Faruq subtracted 5 from a number and then divided by 4 . Next, he subtracted 4 from the original number and then divided by 5 . He got the same final answer both times. The original number was
(A) 4
(B) 15
(C) 9
(D) 20
(E) -9

## Part B: Each correct answer is worth 6.
Let the original number be $x$. Then

$$
\begin{aligned}
\frac{x-5}{4} & =\frac{x-4}{5} \\
5(x-5) & =4(x-4) \\
5 x-25 & =4 x-16 \\
x & =9
\end{aligned}
$$

ANSWER: (C)