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Penjelasan:
A = Andi
T = Tika
Sekarang
T = 2A --> A = T/2
10 tahun lalu
(T - 10) = 4 (A - 10)
(T - 10) = 4 (T/2 - 10)
T - 10 = 2T - 40
T = 30 ------> Jadi usia Tika sekarang = 30 tahun
10 tahun kemudian
= 30 + 10
= 40 tahun