Find the value of "?" in the ball picture Riddle below:

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

A man is found dead in his bathroom naked with blood scattered all around him. The bathroom was locked from the inside and there is no trace of any struggle. There is nothing in the bathroom except his pant with the belt still around and his shirt. Also, the medic team can't find any incision in his body that may have been the reason behind so much blood loss.

The Police department is clueless regarding this murder mystery.
Can you?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

You have two jars of chocolates labelled as P and Q. If you move one chocolate from P to Q, the number of chocolates on B will become twice the number of chocolates in A. If you move one chocolate from Q to P, the number of chocolates in both the jars will become equal.

Can you find out how many chocolates are there in P and Q respectively?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

Which letter of the alphabet has the most water?

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