Question 311426
let the width be x
The length will be x+6

Perimeter = 2L + 2W

=  2(x+6)+2x

2(x+6)+2x=168
2x+12 +2x=168

4x=168-12
4x=156
x=39 the width
Length = 45 inches

39+39+45+45=168