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3 5
umur ibu sekarang = 42 + 3 = 45 tahun
Umur nenek skrg = 45 : 3 x 5 = 15 x 5 = 75 tahun
umur ibu sekarang = 42 + 3 = 45
umur nenek = 5/3 x 45
= 75 tahun