# Difference between revisions of "2020 AMC 8 Problems/Problem 25"

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## Revision as of 13:07, 24 November 2020

Rectangles and and squares and shown below, combine to form a rectangle that is 3322 units wide and 2020 units high. What is the side length of in units?

## Solution 1

Let the side length of each square be . Then, from the diagram, we can line up the top horizontal lengths of , , and to cover the top side of the large rectangle, so . Similarly, the short side of will be , and lining this up with the left side of to cover the vertical side of the large rectangle gives . We subtract the second equation from the first to obtain , and thus .

## Solution 2

Assuming that the problem is well-posed, it should be true in the particular case where and . Let the sum of the side lengths of and be , and let the length of rectangle be . We then have the system which we solve to find that .

## Solution 3 (fast)

Since each pair of boxes has a sum of or and a difference of , we see that the answer is . - A_MatheMagician

## Video Solution

https://www.youtube.com/watch?v=KN441ecLfKM

~savannahsolver