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Two years ago, Jernie was three times as old as his sister, Cecile. In 4 years, he will be only twice his sister's age. Find their present ages.

Solution

Two years ago, Jernie was three times as old as his sister, Cecile. In 4 years, he will be only twice his sister's age. Find their present ages.

Solution

Jernie^{'} s age is : 20

Cecile^{'} s age is : 8

Solution steps

Translate the problem into an equation:

x - 2 = 3 (y - 2), x + 4 = 2 (y + 4)

x - 2 = 3 (y - 2), x + 4 = 2 (y + 4) : x = 20, y = 8

Jernie^{'} s age is : 20

Cecile^{'} s age is : 8

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