Skip to main content
OlympiadHQ

Browse · MATH

Print

jmc

prealgebra intermediate

Problem

In order for Mateen to walk a kilometer(1000m) in his rectangular backyard, he must walk the length 25 times or walk its perimeter 10 times. What is the area of Mateen's backyard in square meters?
Solution
The perimeter is , and this is two lengths and two widths. The length of the backyard is . Since two lengths total 80, the two widths total 20, and the width is 10. The area is .
Final answer
400