You can put this solution on YOUR website! Reading the question the first two times it was too confusing. When looking at it later, it was more understandable and would be better if rewritten like this:
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Find the percent age of John's son, if two years ago, it was one third of his present age. Take John's his present age to be x years.
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Try to find the son's age now:
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------------John's SON'S age NOW, at present.
What kind of percentage the question means, is not clear.
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The above probably still not correct, because the question as originally formed is badly written, mostly incomplete. Rewrite the question properly.