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Misal :Umur Tua = A
Umur Bunga = B
2 tahun yang lalu :
A = 6 × B
Umur Tua dan Bunga sekarang :
A - 2 = 6 × (B - 2)
A - 2 = 6B - 12
A = 6B - 12 + 2
A = 6B - 10 => (pers.1)
18 tahun kemudian :
A = 2 × B
Umur Tua dan Bunga sekarang :
A + 18 = 2 × (B + 18)
A + 18 = 2B + 36
A = 2B + 36 - 18
A = 2B + 18 => (pers.2)
(pers.1) => A = 6B - 10
(pers.2) => A = 2B + 18
6B - 10 = 2B + 18
6B - 2B = 18 + 10
4B = 28
B = 28/4
B = 7
A = 6B - 10
A = 6(7) - 10
A = 42 -10
A = 32
atau
A = 2B + 18
A = 2(7) + 18
A = 14 + 18
A = 32
Jadi umur Tua adalah 32 tahun dan umur Bunga adalah 7 tahun