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wanita = x
7y + 6,2x = 6,5 × 40
7y + 6,2x = 260
7y + 6,2(40-y) = 260
7y + 248 -6,2y = 260
0,8y = 260-248
0,8y = 12
y = 15 siswa
x = 40-y = 40 - 15 = 25 siswa
a) pria : wanita = 15 : 25 = 3 : 5
b) pria = 15 ; wanita = 25