选择题
2000 AMC 8 Problem 16: Backyard Length and Perimeter
In order for Mateen to walk a kilometer (1000 m) 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?
A.
40
B.
200
C.
400
D.
500
E.
1000