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Rule of Three

If it takes four men one day to build a wall, how long does it take 60,000 men to build a similar wall?

Square Pegs

Which is a better fit, a square peg in a round hole or a round peg in a square hole?

How Big?

If the sides of the triangle in the diagram are 3, 4 and 5, what is the area of the shaded square?

Racing Odds

Age 11 to 14
Challenge Level
2 to 1 against the rhinoceros winning means the probability of it winning is 1/3 and 2/3 of it losing (2+1=3).