Which number should replace the question mark?

I look at you, you look at me, I raise my right, you raise your left. What am I?

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

Who always enjoys poor health?

The King of a distant land had heard that Birbal was one of the wisest men in the East and so desired to meet Birbal. He sent Birbal an invitation to visit his country.

In due course, Birbal arrived in the distant kingdom. When he entered the palace he was flabbergasted to find not one but six kings seated there. All looked alike. All were dressed in kingly robes. Who was the real king?

The very next moment he got his answer. Confidently, he approached the king and bowed to him.

How did Birbal know who was the real king?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

What does does this rebus picture means ?

A and B have a certain number of chocolates with them. If B gives one chocolate to A, they will have an equal number of chocolates. But if A gives one chocolate to B, then A will be left with half the number of chocolates that B has.

Can you find out the number of chocolates they have right now?

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