The ages of A and B are in the ratio 5 : 7. Four years from now the ratio of their ages
will be 3:4, then the present age of A is
A 5.
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current age of A = 5x and that of B is 7x
4 years from now
Age of A will be 5x +4 and that of B will be 7x+4
from the question we know
(5x+4)/(7x+4) = 3/4
solving the equation we get
20x + 16 = 21x + 12
x = 4
so current age of A is 5*4 = 20
and that of B is 7*4 = 28
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