What does below Rebus mean ?

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I have branches, but no fruit, trunk or leaves. What am I?

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

What Does this text mean:

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The great emperor Akbar once ruled India. He was well known for his intelligence. But along with that, he was known for the Nine Gems in his court. One of the nine gems was Birbal, a quick witted and extremely intelligent man. The stories of his wit were widely popular.

Once a king ruling in a distant land heard of Birbal. To check his wit, he sent an invitation and called him to visit his land. Akbar allowed Birbal to go and he took off on the journey.

Upon reaching that kings kingdom, he was welcomed with flowers. He was then escorted to the palace of the king. Upon entering the palace, Birbal found that there were six people sitting in front of him adorning the same robe. They were also lookalike and it was hard to judge who the real king was.

After a couple of minutes, Birbal approached one of them and bowed in front of him greeting him.

That was the real king. How did Birbal know who was the real king ?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

You can hear me, but you can't touch or see me.

What am I?

What does this rebus puzzle means ?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

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?