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jumlah nilai anak = na
jumlah anak = ja
7 = na / ja
na = 7 ja
lalu masukan na ke,
7,75 = (na + 27) / (ja + 3)
na + 27 = 7,75 (ja + 3)
7ja + 27 = 7,75ja + 23,25
27 - 23,25 = 7,75ja - 7ja
3,75 = 0,75ja
ja = 3,75 / 0,75
ja = 5
jadi jumlah anaknya ada 5