Which Number is the odd one out?

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

In the image given, you can find several triangles. Can you count them all?

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?

I’m tall when I’m young, and I’m short when I’m old. What am I?

What does below Rebus say?

XLR8

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

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

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?