exam Maths Puzzle Numerical Ability

We have been trying to figure this out and I fear we are over-thinking it. Therefore making it much more complicated than it actually is..Please help.

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Can someone help me on this problem # 64, page 564 in Beginning Algebra textbook?

The problem is: The revenue for a sandwich shop is directly proportional to its advertising b 6/13 of the athletes could complete the obstacle course. If 14 of the athletes could not complete the course, how many could complete it?