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 B os:
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take present age be 5x and 7x
now four years from now
ratio of age will be = 5x +4 / 7x +4 = 3:4
now by cross multiplication 20 X +16 = 21 X + 12
X = 4
so age of A and B will be 20 and 28 years respectively
now four years from now
ratio of age will be = 5x +4 / 7x +4 = 3:4
now by cross multiplication 20 X +16 = 21 X + 12
X = 4
so age of A and B will be 20 and 28 years respectively
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