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It is quite simple...

Let the present age of the younger brother be x

And, present age of elder brother be y

x/y=3/4 eqn1

(x+6)/(y+6)=5/6 eqn 2

Solve these equations simultaniously and u'll get the answer.

x=3y/4

6x+36=5y+30

18y/4+36=5y+30

18y/4=5y-6

18y=20y-24

-2y=-24

y=12 years , that is the present age of elder brthr

x=3(12)/4=9 years , that is the present age of the younger brthr

Usama, uxama_17@hotmail.com

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Q: The ages of two brothers are in the ratio 3 is to 4 but after six years the ratio of their ages will be 5 is to 6 find their present age?
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