A rectangular room is 3 times as long as it is wide, and its perimeter is 56 meters.
We're given the following:
l = 3w
We know the Perimeter (P) of a rectangle is:
P = 2l + 2w
Substituting l = 3w and P = 56 into this equation, we get:
2(3w) + 2w = 56
Multiplying through, we get:
6w + 2w =...