A rectangular field has a length 10 meters more than it is width. If the area of the field is 231, what is the length (in meters) of the rectangular field?
Choose the correct answer:
A) 21  B) 23  C) 25  D) 27  E) 29
area = l * w = (L) * (L-10) = 231   trial and error:    20*10= 
<gadget id="calculator"> 20*10</gadget>
<output>200</output>
200 (too low)   21*11= 
<gadget id="calculator">21*11</gadget>
<output>231</output>
231   The length is 21 meters.   The answer is 21.
<result>A</result>
A rectangular field has a length 10 meters more than it is width. If the area of the field is 231, what is the length (in meters) of the rectangular field?