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14 March, 11:47

A box contains a collection of triangular and square tiles. There are 25 tiles in the box, containing 84 edges total. How many square tiles are there in the box?

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  1. 14 March, 14:31
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    Triangular and square tiles all the 3 sides - the difference is that square tiles have one side more!

    when we first think about the 3 sides: the 25 tiles must then have at least 25*3=75 sides.

    But they have 84. what is the difference? there are 84-75=9 extra sides, which means that there are 9 square tiles.
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