Q14 of 90 Page 113

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. The present age of B is

Let the ages of A and B be 5x and 7x



By cross multiplication


⇒ 4(5x + 4) = 3(7x + 4)


⇒ 21x - 20x = 16 - 12


⇒ x = 4


Age of B = 7x = 28 years

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