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putra = 80
X gab = 79
S = 50
Dit = Putra???
jawab
50 = Putra + putri
Putri = 50- Putra
79 = 75 x (50- putra ) + 80 x putra / 50
79 x 50 = 3750 - 75 putra + 80 putra
3950 = 3750 + 5 putra
200 = 5 Putra
200 : 5 = putra
40 = putra
maka siswa putra adalah 40 orang