SOLUTION: Alex's dad is 45 which is twice the age plus 15 years of Billy. How old is BIlly?

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Question 985014: Alex's dad is 45 which is twice the age plus 15 years of Billy. How old is BIlly?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
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B=Billy's age; D=Dad's age
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D=2B+15yrs
45yrs=2B+15yrs
30yrs=2B
15yrs=B
ANSWER: Billy is 15 years old.