SOLUTION: Mary is 8 years younger than Frank. Frank is 9 years older than Barbara-Sue. The sum of their ages is 300. What is Mary's age?

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Question 1058379: Mary is 8 years younger than Frank. Frank is 9 years older than Barbara-Sue. The sum of their ages is 300. What is Mary's age?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
M=F-8
F=9%2BB
M%2BF%2BB=300
Substituting,
F-8%2BF%2B%28F-9%29=300
3F=317
F=317%2F3
Check your problem setup.
All solutions should be integers and the first one is a fraction.
Correct and repost.