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April 22, 2016

In a rectangular dance hall, how do you place 10 chairs along the walls so that there are equal number of chairs alongside each wall?

February 13, 2016

Here are a few solutions.

Solution 1.

Solution 2.

Solution 3.

When you remove 10 pieces and still keep each row and column even.

February 9, 2016

KEEP IT EVEN !

Take 16 small objects (for example coins, magnets, pieces of paper, etc.) and put them in four rows of 4 as it shown on the right.

Remove 6, leaving an even number of objects in each row and each column.

Try to find as many solutions as many you can.

After you get bored with removing 6 pieces, try to remove 10 pieces.

February 1, 2016