Question 110575
L=W+3 ORE W=L-3
PERIMETER=2L+2W
78=2L+2(L-3)
78=2L+2L-6
78=4L-6
4L=78+6
4L=84
L=84/4
L=21 INCHES.
W=L-3
W=21-3
W=18 INCHES FOR THE WIDTH.
PROOF
2*21+2*18=78
42+36=78
78=78