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12 : 9 = 162 +(3×2)
12 : 9 = 162+6 = 168
perbandingan (12+9=21)
nenek = 12/21 × 168 = 96 tahun
ibu = 9/21×168=72 tahun
umur nenek 2 thn yg akan datang
=96+2=98thn