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?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

How can you take 2 from 5 and leave 4?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?