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nenek=7/15×115=49thn
56-49=7 THN selisihnya
n = nenek
(k - 5) + (n - 5) = 110
k + n - 10 = 110
k + n = 120
umur kakek = 8/15 x 120 = 64
umur nenek = 7/15 x 120 = 56
selisih = 64-56 = 8 tahun