There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

If 2 workers can complete painting 2 walls in exactly 2 hours.

How many workers would be needed to paint 18 walls in 6 hours?

A man dies of old age on his 25 birthday. How is this possible?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?