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7p+7,5p = 7,175
40
7p+7,5p= 28,72
Selanjutnya gk tau
L= laki-laki
7P + 7,5L= 7,175 x 40
7P + 7,5L = 287 (persamaan 1)
P + L = 40 (persamaan 2) ( dikali 7)
eliminasi kedua persaan trsb
7P + 7,5L = 287
7P + 7L = 280
setelah dikurangi mengasilkan L = 7 : 0.5 = 14 siswa laki-laki