How can you write nineteen in a manner that if we take out one, it becomes twenty?

Before Mount Everest was discovered, what was the highest mountain in the world?

What number when divided in half becomes zero?

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

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

There are three boxes. One is labeled "APPLES" another is labeled "ORANGES". The last one is labeled "APPLES AND ORANGES". You know that each is labeled incorrectly. You may ask me to pick one fruit from one box which you choose.

How can you label the boxes correctly?

Can you move 2 matchsticks to form four equal sized squares.