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How many arm-wrestles will there be in the royal arm wrestling championship?

Weekly Problem 45 - 2007
What is the obtuse angle between the hands of a clock at 6 minutes past 8 o'clock?

Calculate the ratio of areas of these squares which are inscribed inside a semi-circle and a circle.

Weekly Problem 4 - 2008
In the figure given in the problem, calculate the length of an edge.

Frank and Gabriel competed in a 200m race. Interpret the different units used for their times to work out who won.

Leonard writes down a sequence of numbers. Can you find a formula to predict the seventh number in his sequence?

The sum of three square numbers equals $121$. What can those numbers be...

Triangle T has sides of lengths 6, 5 and 5. Triangle U has sides of lengths 8, 5 and 5. What is the ratio of their areas?

Four cards from a set numbered 1-36 are dealt. What is the probability that they are dealt in order?

Which digit replaces x in this crossnumber?