GAUSS7 2003 Problem 12

Past Contests GAUSS7 GAUSS (GR. 7) - 2003
, ,
1

The perimeter of a rectangular field is 3 times its length. If the perimeter is 240\:m, the width of the field is

Answer Choices
A. 80\:m
B. 40\:m
C. 20\:m
D. 30\:m
E. 120\:m