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the sum of the ages of a boy and a girl is 18 years. Four years ago the girl was four times the age of the boy. Find the present age of each child.

Solution

the sum of the ages of a boy and a girl is 18 years. Four years ago the girl was four times the age of the boy. Find the present age of each child.

Solution

Boy^{'} s age is : 6

Girl^{'} s age is : 12

Solution steps

Translate the problem into an equation:

18 - x - 4 = 4 (x - 4)

Solve for

x, 18 - x - 4 = 4 (x - 4) : x = 6

Find age

Boy^{'} s age is : 6

Girl^{'} s age is : 12

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