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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?

Solution

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?

Solution

Kevin^{'} s age is : 51

Solution steps

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

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