SOLUTION: Abby and his brother Ben are teenagers. Ben is 3 years younger than Abby and the GCF of their age is 3. How old is Ben?

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Question 1005695: Abby and his brother Ben are teenagers. Ben is 3 years younger than Abby and the GCF of their age is 3. How old is Ben?
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
A = Abby's age
B = Ben's age

B = A - 3
GCF(A, B) = 3

Multiples of 3 from 13 to 19: 15, 18

Ben is 15.