Ta có: \(\left\{{}\begin{matrix}a+b=100\\63.0,01.a+65.0,01.b=63,546\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=100-b\\0,63\left(100-b\right)+0,65b=63,546\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}a=72,7\\b=27,3\end{matrix}\right.\)