Question 887589
A boy is now one-third as old as his father
Twelve years hence he will be half as old as
his father. Then the present age of the boy is
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let x=age of boy
3x=age of father
..
12 yrs hence:
x+12=age of boy
3x+12=age of father
3x+12=2(x+12)
3x+12=2x+24
x=12
present age of the boy is 12