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

Solve the equation in the image by looking at the pattern closely.

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?

Can you find the key in the picture below?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Can you identify if it's a murder or a suicide ?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

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?