what does this below rebus represent identXQQQQQME

Before Mount Everest was discovered, what was the highest mountain in the world?

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Can you identify the hidden rebus in the image below?

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?