This week's numeracy puzzle:
Eric has a perfect spherical shaped apple. With a cylindrically shaped drill bit he removes the core of the apple. A cylindrically shaped hole remains, the centre of this hole is exactly at the centre of the apple. Eric measures the length of the hole with a piece of rope. It turns out to be exactly 8 cm. What is the volume of the remaining apple?
How old are Bob and John?
Last week's solution:
John is 30 years old and Bob 40