The perimeter of a rectangular yard is completely surrounded by a fence that measures 18 meters. What is the length of the yard if the area of the yard is 20 meters squared? Choose the correct choice from the following options
A) 8 B) 2 C) 7 D) 5 E) 1
Perimeter of rectangular yard = 2(l + b) = 18 --&gt; l + b = 9   Area = l * b = 20   b = 9 - l   l(9 - l) = 20   29l - l^2 = 20   l^2 - 9l + 20 = 0   Upon simplifying we get l = 5 or 4. Only 5 is there in the answer choice.   Answer: 5
<result>D</result>
The perimeter of a rectangular yard is completely surrounded by a fence that measures 18 meters. What is the length of the yard if the area of the yard is 20 meters squared?