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umur alya= 60 tahun
kakek= 10/10-6 x 40
umur kakek = 100 tahun
kalau merasa jawaban saya benar tolong penuhi bintang yang di samping ya :D
kakek : alya = 10 : 6
selisih perbandingan = 10 - 6 = 4
kakek = 10/4 x 40 = 100 tahun
alya = 6/4 x 40 = 60 tahun