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Triangle and Squares

Source: 2015 AMC 10 a #2

February 4, 2015
AMC

Problem Statement

A box contains a collection of triangular and square tiles. There are 25 tiles in the box, containing 84 edges total. How many square tiles are there in the box?
<spanclass=′latex−bold′>(A)</span>3<spanclass=′latex−bold′>(B)</span>5<spanclass=′latex−bold′>(C)</span>7<spanclass=′latex−bold′>(D)</span>9<spanclass=′latex−bold′>(E)</span>11 <span class='latex-bold'>(A) </span>3 \qquad<span class='latex-bold'>(B) </span>5\qquad<span class='latex-bold'>(C) </span>7\qquad<span class='latex-bold'>(D) </span>9\qquad<span class='latex-bold'>(E) </span>\text{11}
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