A rectangle has a perimeter of 60. Its length is 1/2(n-6) and its width is 2n+5. What is the value of n?

n must be 3

Step-by-step explanation:

The formula for the perimeter of a rectangle of length L and width W is

P = 2L + 2W.  Substituting (1/2)(n - 6) for L and 2n + 5 for W, we get:

P = 60 = n - 6 + 4n + 10, or:

      60 = 5n + 4, or:

       15 = 5n

Then n must be 3.

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