Seven pipes empty a water tank in five days. In how many days would four pipes empty this tank? Which date of the year sees the longest day? How many digits exist in the binary system of numbers? Circles sharing the same centre are called…? What is the volume of a cube which has edges measuring 5cm? Which Greek mathematician is often referred to as the 'father of geometry'? 'For every action there is an equal and opposite reaction' is one of Newton's Laws of motion, which number law?