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Adik = 2
Selisih umur kakek & adek = 7 - 2 =5
Kakek = 7/5 x 20 = 28
Adik = 2/5 x 20 = 8
btw, itu kakek apa kakak ya?
umur kakek: 7/5 dikali 20 =28
umur adik : 2/5 dikali 20 =8