The width of the rectangle is 8 and is 4/5 of its length, find 3/20 of the square of the rectangle.

To solve this problem, recall the formula for the area of a rectangle. The area of the rectangle is equal to the product of the length and the width. S = a * b, where a is the length and b is the width. We calculate what the length is, knowing that the width is 8 centimeters, which is 4/5 of the length. To find a number by its fractional part, you need to divide this number by a fraction.

8: 4/5 = 8 * 5/4 = 40/4 = 10 centimeters.

Let’s calculate what the area of the rectangle is.

S = 10 * 8 = 80 sq. Cm.

Let’s calculate what is equal to 3/20 part of 80 sq. Cm.

80 * 3/20 = 240/20 = 12 sq. Cm.

Answer: 12 sq. Cm.