\(N=\dfrac{2L}{3,4}=2400\left(nu\right)\Rightarrow C=\dfrac{N}{20}=120\)
Ta có: \(\dfrac{A+T}{G+X}=\dfrac{2A}{2G}=\dfrac{2}{3}\left(1\right)\)
\(\Rightarrow\) Theo bài và \(\left(1\right)\) ta có hệ: \(\left\{{}\begin{matrix}\dfrac{2A}{2G}=\dfrac{2}{3}\\2A+2G=2400\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}A=T=480\left(nu\right)\\G=X=720\left(nu\right)\end{matrix}\right.\)