SOLUTION: Bob is 3 years older than Robby and Amy is twice as old as Bob. The sum of their ages is 57. How old is Bob?

SOLUTION: Bob is 3 years older than Robby and Amy is twice as old as Bob. The sum of their ages is 57. How old is Bob?

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Question 1096120: Bob is 3 years older than Robby and Amy is twice as old as Bob. The sum of their ages is 57. How old is Bob?
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
Let n be Robby's age. Then Bob is n+3, and Amy is 2n+6. So:
n+n+3+2n+6=57
4n=48
n=12
n+3=15
Bob is 15
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