Theo bài ta có : \(A=T=1400(nu)\)
- Mà : \(\left\{{}\begin{matrix}A-G=20\%\\A+G=50\%\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}A=T=35\%\\G=X=15\%\end{matrix}\right.\)
- Ta có : \(A=T=35\%N=1400\left(nu\right)\Rightarrow N=4000\left(nu\right)\)
\(\Rightarrow G=X=15\%N=600\left(nu\right)\)