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pria = x
wanita = 40-x
jawab :
150(x) + 140(40-x) = 148(40)
150x + 5600 - 140x = 5920
10x + 5600 = 5920
10x = 5920 - 5600
10x = 320
x = 320/10
x = 32
jadi, banyaknya pria dalam kelas itu adalah 32 orang