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Penjelasan:
Misal : Anak = A
Paman = P
* 2002 --> A = 1/3 P ==> P = 3A
* 2010 --> A+8 = 3/7 (P+8)
A+8 = 3/7 (3A+8)
7A+56 = 9A+24
2A = 32
A = 16
Jadi, usia anak pada tahun 2002 = 16 tahun
Tahun lahir = 2002 - 16
= 1986