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受欢迎的 Word Problems >

Two years ago John was three times as old as Frank. Five years from now John will be twice as old as Frank. what is the sum of their ages right now?

解答

Tw o ye a rs a g o J o hn w a s t h ree t im es a s o l d a s F r ank . F i v e ye a rs f ro m n o w J o hn w i ll b e tw i ce a s o l d a s F r ank . w ha t i s t h e s u m o f t h e i r a g es r i g h t n o w ?

解答

the sum of their ages : 32

求解步骤

Translate the problem into an equation:

x - 2 = 3 (y - 2), x + 5 = 2 (y + 5)

x - 2 = 3 (y - 2), x + 5 = 2 (y + 5) : x = 23, y = 9

找到 the sum of their ages :

32

the sum of their ages : 32

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