Answer to Question #262175 in Calculus for Amit

Question #262175

Build a rectangular pen with three parallel partitions using 500 feet of fencing. What dimensions will maximize the total area of the pen 


1
Expert's answer
2021-11-14T18:17:12-0500

Diagram is missing.

Adding diagram of the problem:



Solution:

Let , width be xx and length be yy .

The total amount of fencing is given by

500=5x+2y2y=5005xy=250(5/2)x500=5x+2y\\ 2y=500-5x\\ y=250-(5/2)x

Maximum area (A)=xy(A)=xy

A=x(250(5/2)x)A=250x(5/2)x2A=x(250-(5/2)x)\\ A=250x-(5/2)x^2

Diff. w.r.t xx

dAdx=ddx(250x52x2)=2505x\frac{dA}{dx}=\frac{d}{dx}(250x- \frac{5}{2}x^2) =250-5x

For maximum area:

2505x=0x=50250-5x=0\Rightarrow x=50

y=250(5/2)x=250(5/2)(50)=125y=250-(5/2)x=250-(5/2)(50)=125

Hence, width is 50 ft and length is 125 ft.



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