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인기 있는 Word Problems >

Nine years ago, Kevin was seven times as old as Jerry. Nine years from now, Kevin will be two and a half times as old as Jerry. How old is Kevin?

해법

N in e ye a rs a g o, Ke v in w a s se v e n t im es a s o l d a s J erry . N in e ye a rs f ro m n o w, Ke v in w i ll b e tw o an d a ha l f t im es a s o l d a s J erry . Ho w o l d i s Ke v in ?

해법

Kevin^{'} s age is : 51

솔루션 단계

Translate the problem into an equation:

x - 9 = 7 (y - 9), x + 9 = \frac{5}{2} (y + 9)

x - 9 = 7 (y - 9), x + 9 = \frac{5}{2} (y + 9) : x = 51, y = 15

Kevin^{'} s age is : 51

인기 있는 예

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