A rectangular field has a length 10 meters more than it is width. If the area of the field is 171, what is the length (in meters) of the rectangular field?	Choose the correct choice from the following answers:  A) 17  B) 19  C) 21  D) 23  E) 25

Rationale: area = l * w = ( l ) * ( l - 10 ) = 171 trial and error : 20 * 10 = 200 ( too high ) 19 * 9 = 171 the length is 19 meters . the answer is b .
Answer: B