The perimeter of a rectangular yard is completely surrounded by a fence that measures 36 meters. What is the length of the yard if the area of the yard is 40 meters squared? Pick one.
A) 12	B) 10	C) 8	D) 14	E) 16
Perimeter of rectangular yard = 2(l + b) = 36 --&gt; l + b = 18   Area = l * b = 40   b = 18 - l   l(18 - l) = 40   18l - l^2 = 40   l^2 - 18l + 40 = 0   Upon simplifying we get l = 5 or 8. Only 8 is there in the answer choice.   Answer: 8
<result>C</result>
The perimeter of a rectangular yard is completely surrounded by a fence that measures 36 meters. What is the length of the yard if the area of the yard is 40 meters squared?