Question

7yr ago, the ages of A and B were in the ratio 4 : 5 and 7 yr hence, they f B is​

Answer 1

Answer:

Let A and B be the present ages

SEVEN YEARS AGO

(A-7)/(B-7)=4/5

5A-35=4B-28

5A-4B=7 [Eq.1]

SEVEN YEARS HENCE

(A+7)/(B+7)=5/6

6A+42=5B+35

6A-5B=-7 [Eq.2]

USING Eq.1and Eq.2

A=63 , B=77 are the present ages in years