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Verified answer
U. kakak = 7/7+5 × 10U. Kakak = 7/12 × 10
U. kakak = 70/12 = 5 10/12 = 5 5/6 tahun
U. Adik = 5/12 × 10
U. Adik = 50/12 = 4 2/10 = 4 1/5 tahun