SOLUTION: A large rectangular gymnasium floor is covered with unit square tiles, most of them blank, in the pattern shown in the diagram below. Find the fraction of tiles that are not blank?

Question 1177012: A large rectangular gymnasium floor is covered with unit square tiles, most of them blank, in the pattern shown in the diagram below. Find the fraction of tiles that are not blank?
Link for the image: https://drive.google.com/file/d/12t-r9VB86nTYiLfTD8yE4ZiDnS_Zdmel/view?usp=sharing
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

there is rows and columns
so, total number of unit square tiles is
there are tiles that are not blank

the fraction of tiles that are not blank is
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