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Mock AIME 4 2006-2007 Problems/Problem 11

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Problem

Let \triangle ABC be an equilateral triangle. Two points D and E are chosen on \overline{AB} and \overline{AC}, respectively, such that AD = CE. Let F be the intersection of \overline{AE} and \overline{CD}. The area of \triangle ABC is 13 and the area of \triangle ACF is 3. If \frac{CE}{EA}=\frac{p+\sqrt{q}}{r}, where p, q, and r are relatively prime positive integers, compute p+q+r.

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Want to learn how to tackle those tough MATHCOUNTS and AMC counting and probability problems? Check out Art of Problem Solving's Introduction to Counting & Probability by David Patrick.
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