A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

What's the only room from which no one can enter or leave

What begins with T, ends with T, and has T in it?

In the picture given below, can you find out which digit will take place of the question mark?

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)

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Can you make four (4) nines (9) equal 100?