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受欢迎的 Word Problems >

Dan is twice as old as Bob. The sum of their ages seven years ago was 13. How old are they now

解答

D an i s tw i ce a s o l d a s B o b . T h e s u m o f t h e i r a g es se v e n ye a rs a g o w a s 13. Ho w o l d a re t h ey n o w

解答

Bob^{'} s age is : 9

Dan^{'} s age is : 18

求解步骤

Translate the problem into an equation:

2 x - 7 + x - 7 = 13

求解

x, 2 x - 7 + x - 7 = 13 : x = 9

找到 age

Bob^{'} s age is : 9

Dan^{'} s age is : 18

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