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Verified answer
Jawabn1+n2= 35
x1 = 156
n1 = banyak putra
x2 = 128
n2 = banyak putri
xs = 140
(n1+n2) xs = n1 x1 + n2 x2
(n1+n2) 140 = n1(156) +n2(128)
n2(140 - 128) = n1(156-140)
12 n2 = 16 n1
n1 : n2 = 12 : 16
n1 : n2 = 3 : 4 (jumlah perb = 7)
n1 + n2 = 35
n1 = 3/7 (35)
n1 = 15
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