Find the area of a rectangle if its perimeter is 92 and the ratio of adjacent sides is 3:20.

1. Let us find what the sum of the numbers of the ratios of the neighboring sides is equal to, that is, the length and width of the rectangle.
3 + 20 = 23.
2. Find out what one part is equal to.
92/23 = 4 centimeters.
3. Find out what the sum of the two sides (width) of the rectangle is equal to.
4 * 3 = 12 cm.
4. Find out what the width of the rectangle is.
12/2 = 6 cm.
5. What is the sum of the other two sides (length).
4 * 20 = 80 cm.
6. What is the length of the rectangle.
80/2 = 40 cm.
7. Find the area of the rectangle.
6 * 40 = 240 sq. Cm.
Answer: The area of a rectangle is 240 square centimeters.