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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.

Soluzione

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.

Soluzione

Jisoo^{'} s age is : 22

Jennie^{'} s age is : 13

Fasi della soluzione

Translate the problem into an equation:

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

Risolvi per

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

Trova age

Jisoo^{'} s age is : 22

Jennie^{'} s age is : 13

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