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A doctor's age 8 years ago is two-thirds his age 13 years hence. How old is he now?

 Jul 5, 2020
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d-8 = 2/3 (d+13)     (given)

1/3d =  26/3 + 8

d = 26 + 24

d = 50 y/o now

 Jul 5, 2020

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