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John is twice as old as his son In 42 years the ratio of their ages will be 4 to 3 What is the son's current age?
Wiki User
∙ 14y ago
Suppose the son is x. Then John is 2x.
In 42 years, son will be x+42 and John will be 2x+42.
So (2x+42)/(x+42) = 4/3 [Make sure you have the ratio the correct way around - with John first].
ie 3*(2x+42) = 4*(x+42)
6x + 3*42 = 4x + 4*42 or 2x = 42 or x = 21
So the son's current age is 21.
Wiki User
∙ 14y ago
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