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受欢迎的 Word Problems >

mark is four years younger than robert. Twenty years ago, mark was thirteen years more than half the age of Robert. How old are they now

解答

ma r k i s f o u r ye a rs yo u n g er t han ro b er t . Tw e n t y ye a rs a g o, ma r k w a s t hi r t ee n ye a rs m ore t han ha l f t h e a g e o f R o b er t . Ho w o l d a re t h ey n o w

解答

Mark^{'} s age is : 50

Robert^{'} s age is : 54

求解步骤

Translate the problem into an equation:

x - 20 = 13 + \frac{1}{2} (x + 4 - 20)

求解

x, x - 20 = 13 + \frac{1}{2} (x + 4 - 20) : x = 50

找到 age

Mark^{'} s age is : 50

Robert^{'} s age is : 54

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