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Prempuan = p laki-laki= L
72P + 70L / (P + L) = 70,8
72P + 70L = 70,8P + 70,8L
72P - 70,8P = 70,8L - 70L
1,2P = 0,8L
P : L = 0,8 : 1,2 = 8 : 12
= 8x : 12x --->(misal x variabel pembanding)
P + L = 35
8x + 12x = 35
20x = 35
x = 1,75
P = 8x = 8 x 1,75 = 14 siswa
L = 12x = 12 x 1,75= 21 siswo