A picture frame has a perimeter of 100 cm. Its width is 4 cm less than twice its length. What is the width of the picture frame?

Let the length be L cm, so the width is 2L − 4 cm. Since the perimeter is 100 cm, L + width = 50, giving L + 2L − 4 = 50; therefore L = 18 and the width is 2(18) − 4 = 32 cm. The correct choice is 32 cm.

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