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Five years ago, John's age was half of the age he will be in 8 years. How old is he now?

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Its just a matter of trial and error and i got 18 as the answer

since it was stated that five years ago is half of his age 8 years from now then you'll have the equation as:

twice John's age five years ago is equal to his age eight years from now

2(x-5) = x + 8

2x - 10 = x + 8

2x - x = 8 + 10

x = 18