Why is 6 afraid of 7?

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?

What is the riddle which can be asked all day with a different correct answer each time.

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

You bought me for dinner but never eat me. What am I?

What breaks yet never falls, and what falls yet never breaks?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

If you paint a brown house white it will become a white house. If the stoplight changes from red to green, then the light is green. So, if you throw a white shirt into the Red Sea, what will it become?