Ta có : A1=T2=25% \(\dfrac{N}{2}\)
T1=A2=15%\(\dfrac{N}{2}\)
=>A=T=A1+A2=(25%+15%)\(\dfrac{N}{2}\)=40%\(\dfrac{N}{2}\)=20%N.
Vì 2A+2G=N => A+G=50%N => G=50%-20%=30%=600(nu)
=> A=T=600:30%*20%=400(nu)
=> N=2A+2G=2*400 + 2*600=800 + 1200= 2000(nu)
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