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Jisoo is 9 years older than her friend, Jennie. Four years ago, she was two times as old as her friend. Find the present age of each.

Solution

Jisoo is 9 years older than her friend, Jennie. Four years ago, she was two times as old as her friend. Find the present age of each.

Solution

Jisoo^{'} s age is : 22

Jennie^{'} s age is : 13

Solution steps

Translate the problem into an equation:

x - 4 = 2 (x - 9 - 4)

Solve for

x, x - 4 = 2 (x - 9 - 4) : x = 22

Find age

Jisoo^{'} s age is : 22

Jennie^{'} s age is : 13

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