Quantitative Aptitude :: Problems on Ages - Discussion

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Explanation:
As per the formula( If the given ages in a ratio a : b then age will be ax and bx.)
so A and B age will be 8x and 5x respectively.
=> 8x+5x = 39 => 13x=39
=> x=39/13=3
A nad B age will be 25 and 15 respectively.
After 9 yr,
A and B age will be 33 and 24.
So, the ratio of their ages A:B::11:8