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5a = 25
a = 25/5
a = 5
umur kakak = 3 x 5
= 15 thn
umur adik = 2 x 5
= 10 thn
Umur kakak = 3/5 x 25 = 75/5 = 15 tahun
Umur adik = 2/5 x 25 = 50/5 = 10 tahun
= 15 tahun + 10 tahun = 25 tahun.
Semoga membantu ;)