What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

What do you get if you add 2 to 100 four times?

What am I?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Which word does the below Plexor means ?

You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game.

Would you want to play first or second?

PS: The sum should be exactly 15.

What has no start, end, or centre?

What does it mean?

Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?