How can you make number one disappear by adding something to it?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Why is the longest human nose just 11 inches?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

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

which number am I?

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?

You are given 2 eggs.
You have access to a 100-storey building.
Eggs can be very hard or very fragile means it may break if dropped from the first floor or may not even break if dropped from 100th floor, Both eggs are identical.
You need to figure out the highest floor of a 100-storey building an egg can be dropped without breaking.
Now the question is how many drops you need to make. You are allowed to break 2 eggs in the process

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

What is the fastest way to double your money?

A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?