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Dodi = b
Lima tahun yang lalu =
A - 5 = 3(b - 5)
A - 5 = 3b - 15
A = 3b - 15 + 5
A = 3b - 10
Tahun ini =
A = 2b
A = A
3b - 10 = 2b
3b - 2b = 10
b = 10
A = 2b
A = 2(10)
A = 20tahun
5tahun kemudian =
(5 + 10) + (5 + 20) =
15 + 25 =
40tahun
#semoga membantu....