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70= 66×20 + 75×n2 ÷ 20+n2
1400+70n2= 1320+75n2
80= 5n2
n2= 80÷5
n2= 16
x1 = 66
n2 = n2
x2 = 75
xg = 70
(n1+n2) xg = n1 x1 + n2 x2
(n1+n2)70 = n1(66) + n2(75)
(70-66) n1 = (75-70)n2
4 n1 = 5 n2
n2 = (4/5) n1
n2 = (4/5)x20 = 16