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a:i=8:7
a=8/8+7x90
=8/15x90
=48
i=7/8+7x90
=7/15x90
=42
jadi, umur ayah 48 tahun, ibu 42 tahun
ayah : ibu = 8 : 7
jumlah perbandingan = 15
umur ayah = 8/15 x 90
= 48