What is the length and width of a retangular whose perimeter is 42?

2Lx2W=42 lol

I can't argue with that answer! But maybe this will help enplane it:

Your question has an infinite number of possible answers. For example, a 1 X 20 triangle would have a perimeter of 42. And so would a 2 X 19, a 3 X 17, a 10.5 x 10.5, or an 11.3 X 9.7 rectangle, etc, etc.