Answer:
W = 4.3 units
Step-by-step explanation:
This rectangle has a perimeter of 20 units. Its width is 3/4 of the way assuming it means 3/4 of the length then w = 3/4 l and the length is l. We can add these expressions together and set it equal to the perimeter then solve for l.
P = l + l + w + w
20 = l + l + 3/4l + 3/4l
20 = 3 2/4 l
20 = 3 1/2 l or 20 = 3.5l
l = 5.7
This means the width will be w = 3/4 l = 3/4(5.7) = 0.75(5.7) = 4.3
