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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?

Solución

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?

Solución

Kevin^{'} s age is : 51

Pasos de solución

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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