According to Plutarch, the Greeks found all the rectangles with integer sides, whose areas are equal to their perimeters. Can you find them? What rectangular boxes, with integer sides, have. . . .
When asked how old she was, the teacher replied: My age in years is not prime but odd and when reversed and added to my age you have a perfect square...
N people visit their friends staying N kilometres along the coast. Some walk along the cliff path at N km an hour, the rest go by car. How long is the road?
Use the numbers in the box below to make the base of a top-heavy pyramid whose top number is 200.
If the sides of the triangle in the diagram are 3, 4 and 5, what is the area of the shaded square?