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?

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Question 279272: 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 by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
John, Bill, Greg
J=2B
G=7+B
J-4+B-4+G-4=55
J+B+G=67
2B+B+7+B=67
4B=60
B=15
J=30
G=22
checking
30+15+22=67
67=67