Problem
Four friends, Art, Roger, Paul and Trisha, bake cookies, and all cookies have the same thickness. The shapes of the cookies differ, as shown: Art's cookies are trapezoids, Roger's cookies are rectangles, Paul's cookies are parallelograms, and Trisha's cookies are triangles. [See figure in original PDF]
Each friend uses the same amount of dough, and Art makes exactly cookies. How many cookies will be in one batch of Trisha's cookies?
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