The ratio between the present ages of A and B is 3 : 4. If B is 6 years old than A, what will be the ratio of the ages OS A and B after 3 years?
Solution: Let A's age and B's age be 3x years and 4x years respectively. Then, 4x-3x=6 <==> x = 6.
.'. Required ratio = (3x+3) : (4x+3) = 21 : 27 = 7 : 9.
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