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y = banyaknya putri
(68x + 72y) / (x + y) = 70,5
68x + 72y = 70,5x + 70,5y
72y - 70,5y = 70,5x -68
1,5y = 2,5x
3y = 5x
perbandingan siswa putra dan putri 3 berbanding 5