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perempuan = x
laki2 = 30-x
jawab:
135(x) + 138(30-x) = 137(30)
135x + 4140 - 138x = 4110
4140 - 3x = 4110
-3x = 4110 - 4140
-3x = -30
x = 10
jadi, banyaknya perempuan dalam kelas itu adalah 10 orang