Problema Solution
John is twice as old as bill. Greg is 7 years older than Bill. Four years ago, the sum of their ages was 55. How old is Greg?
Answer provided by our tutors
let 'x' represent Bill's age, then 'x+7' represents Greg's age and '2x' represents John's age
Four years ago, the sum of their ages was 55:
(x-4) + (x+7-4) + (2x-4) = 55
solving for 'x' we have x=15
15+7=22
2*15=30
Greg is 22 years old