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In this game the winner is the first to complete a row of three. Are some squares easier to land on than others?

If you have a large supply of 3kg and 8kg weights, how many of each would you need for the average (mean) of the weights to be 6kg?

A monkey with peaches, keeps a fraction of them each day, gives the rest away, and then eats one. How long can his peaches last?

Which armies can be arranged in hollow square fighting formations?