2 out of 3
Is there a temperature at which Celsius and Fahrenheit readings are the same?
2 out of 3
The triathlon is a physically gruelling challenge. Can you work out which athlete burnt the most calories?
3 out of 3
A garrison of 600 men has just enough bread ... but, with the news that the enemy was planning an attack... How many ounces of bread a day must each man in the garrison be allowed, to hold out 45 days against the siege of the enemy?
3 out of 3
Imagine you were given the chance to win some money... and imagine you had nothing to lose...
2 out of 3
A Sudoku with clues as ratios.
1 out of 3
Have you ever wondered what it would be like to race against Usain Bolt?
1 out of 3
Andy wants to cycle from Land's End to John o'Groats. Will he be able to eat enough to keep him going?
2 out of 3
Two ladders are propped up against facing walls. At what height do the ladders cross?
2 out of 3
Two motorboats travelling up and down a lake at constant speeds leave opposite ends A and B at the same instant, passing each other, for the first time 600 metres from A, and on their return, 400 metres from B. How long is the lake?
2 out of 3
A circle of radius r touches two sides of a right angled triangle, sides x and y, and has its centre on the hypotenuse. Can you prove the formula linking x, y and r?
