The perimeter of a rectangular shelf is 60 inches. The shelf is 7 inches deep. How wide is it? | MathCelebrity Forum

The perimeter of a rectangular shelf is 60 inches. The shelf is 7 inches deep. How wide is it?

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The perimeter of a rectangular shelf is 60 inches. The shelf is 7 inches deep. How wide is it?

The perimeter for a rectangle is given below:
P = 2l + 2w

We're given l = 7 and P = 60. Plug this into the perimeter formula:
60 = 2(7) + 2w
60 = 14 + 2w

Rewritten, it's 2w + 14 = 60.

Typing this equation into our search engine, we get w = 23.
 
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