How many numbers do you need to remove to avoid making a perfect square?
Alberta won't reveal her age. Can you work it out from these clues?
Andy is desperate to reach John o'Groats first. Can you devise a winning race plan?
Albert Einstein is experimenting with two unusual clocks. At what time do they next agree?
If all the arrangements of the letters in the word ANGLE are written down in alphabetical order, what position does the word ANGLE occupy?
In how many different ways can a row of five "on/off" switches be set so that no two adjacent switches are in the "off" position?
How many triples of points are there in this 4×4 array that lie on a straight line?
To win on a scratch card you have to uncover three numbers that add up to more than fifteen. What is the probability of winning a prize?
At how many times between 10 and 11 o'clock are all six digits on a digital clock different?
The teacher has forgotten which pupil won which medal. In how many different ways could he give the medals out to the pupils?
