Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

If eleven plus two equals one, what does nine plus five equal?

Why do you find that most of the buildings are deprived of the 13th floor?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)

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?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

What has to be broken before you can use it?

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?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?