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人気のある Word Problems >

In 4 years’ time, a mother will be three times as old as her son. Four years ago she was five times as old as her son. Find their present ages.

解

I n 4 ye a rs ’ t im e, a m o t h er w i ll b e t h ree t im es a s o l d a s h er so n . F o u r ye a rs a g o s h e w a s f i v e t im es a s o l d a s h er so n . F in d t h e i r p rese n t a g es .

解

Mother^{'} s age is : 44

Boy^{'} s age is : 12

解答ステップ

Translate the problem into an equation:

x + 4 = 3 (y + 4), x - 4 = 5 (y - 4)

x + 4 = 3 (y + 4), x - 4 = 5 (y - 4) : x = 44, y = 12

Mother^{'} s age is : 44

Boy^{'} s age is : 12

人気の例

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