<PRE><B>Question 1060259</B>
length(l) = 2 * width(w)
:
l = 2w
:
Perimeter = 2(2w) + 2w = 6w
:
we are given two equations
:
1) 6w / 12 = n, where n is number of posts
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2) 6w / 16 = n - 66
:
substitute 6w / 12 for n in equation 2
:
6w / 16 = (6w / 12) - 66
:
use 48 as common denominator, multiply both sides of = by 48
:
3 * 6w = (4 * 6w) - (66 * 48)
:
18w = 24w - 3168
:
6w = 3168
:
w = 528 feet
:
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Area(A) = (528 * 2) * 528 =  557,568 square feet
:
1 Acre = 43,560 square feet
:
A in acres = 557,568 / 42,560 = 13.1008
:
A in acres is approximately 13.1 acres
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