a) Ta có: `N = 100%`
`T + X = 50%`
`20% + X = 50%`
`=> X = 30%`
Theo NTBS:
`A = T = 20%`
`G = X = 30%`
b) `X = 30%N`
`=> 300 000 = 30%N`
`=> N = \frac{300 000}{30%} = 1000 000` (nu)
`=> X = G = 300 000` (nu) (NTBS)
Mà `A + G = \frac{N}{2}`
`=> A + G = 500 000`
`=> A + 300 000 = 500 000`
`=> A = 200 000` (nu)
`=> A = T = 200 000` (nu) (NTBS)
😊