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

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

How can one talk without saying a single word?

What is the next number in this series?

4,12,84,3612....

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?