A man's age is three times his son's age. Ten years ago he was five times his son's age. What is their present age?
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let the present age of the son be x
present age of the man is 3x
3x - 10 = 5(x - 10)
3x -10 = 5x - 50
-10 + 50 = 5x - 3x
2x = 40
x = 20
age of the man is 60 and age of son is 20
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