Answers

2016-03-21T18:44:24+05:30
Son's age. Father's age
n. n+30
after 12 years. after 12 years
n+12. 42+n
=3(12+n).
36+3n. = 42+n
= 2n=6
= n= 3
present age of son is 3 and father is 33
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