If it took eight men ten hours to build a wall, how long would it take four men to build it?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

What month of the year has 28 days?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

What has no start, end, or centre?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

Solve the equation in the image by looking at the pattern closely.

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *