SOLUTION: The ratio of the ages of 3 children is 1:3:5. The oldest child is 12 years older than the youngest child. How old is the middle child?

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Question 1131352: The ratio of the ages of 3 children is 1:3:5. The oldest child is 12 years older than the youngest child. How old is the middle child?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
ages are x, 3x, 5x
5x=x+12
4x=12
x=3
ages are 3,9,15
the middle child is 9