2016 AMC 10B Problems/Problem 11
Carl decided to fence in his rectangular garden. He bought fence posts, placed one on each of the four corners, and spaced out the rest evenly along the edges of the garden, leaving exactly yards between neighboring posts. The longer side of his garden, including the corners, has twice as many posts as the shorter side, including the corners. What is the area, in square yards, of Carl’s garden?
If the dimensions are , then one side will have posts (including corners) and the other (including corners).
The total number of posts is .
This diagram represents the number of posts around the garden.
We solve the system to get . Then the area is which is .
~Edits by BakedPotato66
To do this problem, we have to draw a rectangle. We also have to keep track of the fence posts. Putting a post on each corner leaves us with only posts. Now there are twice as many posts on the longer side then the shorter side. From this, we can see that we can put posts on the longer side and posts on the shorter side. On the shorter side, we have spaces between the posts. On the longer side, we have spaces between the fence posts. There are yards between each post. Therefore, the answer is .
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