An isosceles triangle has two sides of equal length. The third side is 7 less than twice the length of one of the other sides. If the perimeter of the triangle is 44 cm, what is the length of the third side?

Let each of the two equal sides be x cm. Then the third side is 2x − 7, so the perimeter gives 2x + (2x − 7) = 44. Solving gives x = 12.75, and the third side is 2(12.75) − 7 = 18.5 cm, choice D.

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