What Deficiency does the below rebus represent?

VIT_MIN

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What does this Rebus Picture mean?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.