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Mike is three times as old as his little sister.Mary In 4 years.he will be twice as old as Mary How old is Mike?
Wiki User
∙ 13y ago
M = 3s
and
(M+4) = 2 (s+4)
Substitute the first equation in the second one.
(3s+4) = 2 (s+4)
3s + 4 = 2s + 8
3s = 2s + 4
s = 4
M = 3s = 12
Wiki User
∙ 13y ago
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