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wanita = x
pria = y
x + y = 35
x = 35 - y
65x + 72y = 69 × 35
disubtitusikan
65(35-y) + 72y = 2415
2275 - 65y + 72y = 2415
7y = 2415 - 2275
y = 140/7
y = 20
jadi banyak siswa pria = 20 orang