Theo đề, ta có:
\(\left\{{}\begin{matrix}2\left(Z_M+Z_x\right)+N_M+N_X=60\\2\left(Z_M+Z_X\right)-\left(N_M+N_X\right)=20\\2Z_M-2Z_X=8\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}Z_M+Z_X=20\\Z_M-Z_X=4\end{matrix}\right.\)
\(\Leftrightarrow Z_M=12;Z_X=8\)