1999 CEMC Gauss (Grade 7) Problems/Problem 13
Problem
In the diagram, the percent of small squares that are shaded is
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Solution
Using the diagram, we can see that nine of the rectangles are shaded, and that the large square has a side length of .
Since the large square has a side length of , its area is
.
Therefore, the percentage of small squares that are shaded is . So, the answer is
.