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A boy is 6 years older than his sister. In three years, he will be twice her age. What are their current ages?

Solution

A boy is 6 years older than his sister. In three years, he will be twice her age. What are their current ages?

Solution

Boy^{'} s age is : 9

Sister^{'} s age is : 3

Solution steps

Translate the problem into an equation:

x + 3 = 2 (x - 6 + 3)

Solve for

x, x + 3 = 2 (x - 6 + 3) : x = 9

Find age

Boy^{'} s age is : 9

Sister^{'} s age is : 3

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