David is three years older than John.In 8years time, John age will be 7/8 of David's age.find their age.

Answer 1

John's age --- x
David's present age --- x+3

in 8 yrs:
John = x+8
David = x+3 + 8 = x+11

x+8 = (7/8)(x+11)
solve for x and finish

Answer 2

Thank you reiny