A/G= 2/3
=> G=1,5A
H=2A+3G
<=> 3900=2.A+3.1,5A
<=> 3900= 6,5A
<=>A=T=600 (Nu)
G=X=1,5A=1,5.600=900(Nu)
A : G = 2 : 3
=> A = \(\dfrac{2}{3}\) G
Tổng số nu là :
2A + 2G = 3900
=> \(\dfrac{4}{3}\) G + 2G = 3900
=> G = 1170
G = X = 1170 (nu)
A = T = \(\dfrac{2}{3}\) G = \(\dfrac{2}{3}\) *1170 = 780 (nu)