Ann is 4 years older than Julie. 4 years ago Ann was twice as old as Julie. Find their present ages.

解

A nn i s 4 ye a rs o l d er t han J u l i e . 4 ye a rs a g o A nn w a s tw i ce a s o l d a s J u l i e . F in d t h e i r p rese n t a g es .

Ann^{'} s age is : 12

Julie^{'} s age is : 8

解答ステップ

Translate the problem into an equation:

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

x

を解く

x - 4 = 2 (x - 4 - 4) : x = 12

発見する age

Ann^{'} s age is : 12

Julie^{'} s age is : 8