Mathematics

Mathematics, 12.05.2021 14:50, KenjiLuv

4 boys can scrub the whole floor of a school hall in two and half hours how long will it take 5 boys to scrub the floor at the same rate

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Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

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