Question

A rectangular room is three times as long as it is wide, and its perimeter is 56 meters. whats the length?

Answer 1

W=3/4L
P=2L=2W
70=2L+2(3/4L)
70=2L+6L/4
70=2L+1.5L
70=3.5L
L=70/3.5
L=20 FT. ANS. FOR THE LENGTH.
W=4/4*20=15 ANS. FOR THE WIDTH


i think. 

Answer 2

Let x = width (W)
    3x = length (L)
P = 2(L+W) = 2 (3x +x)

So now you have:
2 (4x) = 56
8x = 56
x = 56/8
x = 7

Length = 3x = 3 * 7 = 21