The width of the rectangle is 48 centimeters, which is three sixteenths of its perimeter, find the length of this rectangle

Let’s make a proportion to find what the perimeter of the rectangle is:
48 — 3/16
X — 1
X = 48 * 1 / (3/16) = 48 * 16/3 = 256 cm.
We write down the equation of the perimeter, and substitute the known ones:
2 * W + 2 * L = P
2 * 48 + 2D = 256
Let us express the unknown quantity from the equation:
L = (256-2 * 48) / 2 = 80 cm
Answer: 80 cm length of the rectangle.