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Misalkan umur saudara Mary = s.
16 = 4s
16 = 4s
4 = s
m + a = 2(s + a)
16 + a = 2(4 + a)
16 + a = 8 + 2a
a - 2a = 8 - 16
-a = -8
a = 8
m = a + 16
= 8 + 16
= 24
Jadi umur Mary ketika umurnya dua kali umur saudaranya adalah 24 tahun.