Ans: A
Let $x$ be the number of male workers.
Let $x$ be the number of male workers.
Then the number of female workers is $x\div (1-20\%)$.
Hence, we have
$\begin{array}{rcl}
x + x\div(1-20\%) & = & 792 \\
x + \dfrac{x}{0.8} & = & 792 \\
0.8x + x & = & 633.6 \\
1.8x & = & 633.6 \\
x & = & 352
\end{array}$
Therefore, the number of male workers is 352.
