x = jumlah nilai perempuan
y = jumlah nilai laki2
a = jumlah anak perempuan
b = jumlah anak laki2
x/a = 79
x = 79a
y/b = 71
y = 71b
a + b = 32
b = 32 - a
(x + y) / (a + b) = 76
(79a + 71b) /32 = 76
79a + 71b = 2432
79a + 71(32-a) = 2432
79a + 2272 - 71a = 2432
8a = 160
a = 20(d)
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x = jumlah nilai perempuan
y = jumlah nilai laki2
a = jumlah anak perempuan
b = jumlah anak laki2
x/a = 79
x = 79a
y/b = 71
y = 71b
a + b = 32
b = 32 - a
(x + y) / (a + b) = 76
(79a + 71b) /32 = 76
79a + 71b = 2432
79a + 71(32-a) = 2432
79a + 2272 - 71a = 2432
8a = 160
a = 20(d)