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In triangle ABC, point D lies on side BC such that ΔABD and ΔACD have the same perimeter. Points E and F are constructed on sides CA and AB in a similar manner, respectively, each dividing ΔABC into two triangles of equal perimeter. If BD=5, DC=3, and the perimeter of ΔABC is 18, what is the ratio of the area of ΔDEF to the area of ΔABC?

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Answer:

10

Explanation:

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