Q. 144.3( 27 Votes )

The ages of A and A. 20 years

B. 28 years

C. 15 years

D. 21 years

Answer :

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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The ages of A and A. 20 yearsB. 28 yearsC. 15 yearsD. 21 years