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受欢迎的 Word Problems >

A boy is 6 years older than his sister. In three years, he will be twice her age. What are their present ages?

解答

A b oy i s 6 ye a rs o l d er t han hi s s i s t er . I n t h ree ye a rs, h e w i ll b e tw i ce h er a g e . Wha t a re t h e i r p rese n t a g es ?

解答

Boy^{'} s age is : 9

Sister^{'} s age is : 3

求解步骤

Translate the problem into an equation:

x + 3 = 2 (x - 6 + 3)

求解

x, x + 3 = 2 (x - 6 + 3) : x = 9

找到 age

Boy^{'} s age is : 9

Sister^{'} s age is : 3

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