The length of a rectangular field is 7/5 its width. If the perimeter of the field is 384 meters, what is the width of the field? Pick.
A) 50 B) 60 C) 11 D) 80 E) 90

Rationale: "let l be the length and w be the width . l = ( 7 / 5 ) w perimeter : 2 l + 2 w = 384 , 2 ( 7 / 5 ) w + 2 w = 384 solve the above equation to find : w = 80 m and l = 112 m . correct answer d ) 80"
Answer: D