21. A son present age is half the present age of the mother. Ten years age the mother was thrice as old as
her son.What are their present ages?
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Let mother's current age be x. Then, son's present age will be x/2, since the son's age is half mother's current age. Thus, 3x-2x = 60-20. This gives x = 40, i.e. mother's current age is 40.
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