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7,0 = 6,4.n1 + 7,4.n2 / n1 + n2
7 n1 + 7 n2 = 6,4 n1 + 7,4 n2
0,6 n1 = 0,4 n2
6n1 = 4n2
n1/n2 = 4/6 atau 2/3
n1 = laki-laki
n2 = perempuan
6,4 x + 7,4y = 7x + 7y
7,4y - 7y = 7x - 6,4x
0,4y = 0,6x
2y = 3x-------y : x = 3 : 2-----x :y = 2 : 3
Maka Perbandingan Putra dan putri 2 : 3