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受欢迎的 Word Problems >

mother is twice as old as her daughter now,:but 10 years ago, she was 3 times as old as her:daughter. Find their ages at present.

解答

m o t h er i s tw i ce a s o l d a s h er d a ug h t er n o w, : b u t 10 ye a rs a g o, s h e w a s 3 t im es a s o l d a s h er : d a ug h t er . F in d t h e i r a g es a t p rese n t .

解答

Daughter^{'} s age is : 20

Mother^{'} s age is : 40

求解步骤

Translate the problem into an equation:

2 x - 10 = 3 (x - 10)

求解

x, 2 x - 10 = 3 (x - 10) : x = 20

找到 age

Daughter^{'} s age is : 20

Mother^{'} s age is : 40

流行的例子

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