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Sorting hats

Posted on: September 27th, 2013 by

There are 16 hats: 4 red, 4 blue, 4 green, 4 yellow. Each of the 4 hats of a color are to be labeled a '+','-','x' or '÷' and all 4 arithmetic sign labels must be used exactly once per color. Thus a hat can be identified uniquely by it's color and symbol. Arrange the 16 hats in a 4x4 grid so that no two rows or columns have a repeating color or a repeating sign. Some hats are already labeled and placed in the grid.

Puzzle Image

- via Math Fair

One Response to Sorting hats

  1. Sid Hollander had this to say about that:

    Y B R G
    G R B Y
    B Y G R
    R G Y B

    X + - /
    - / X +
    / - + X
    + X / -

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