what does the below math rebus puzzle mean?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

One day, all the courtiers from Akbar's court were gathered in the assembly hall when one of them told the Emperor that all his valuables had been stolen by a thief the previous night.
This shocked the Emperor to his core as the place where that courter stayed was the most secured in the kingdom. The Emperor thought that it is not at all possible for an outsider to enter into the courtier's house and steal the valuables. Only another courtier could commit this crime. He quickly called Birbal to identify the thief.
Birbal thought for a while and successfully solved the mystery by identifying the thief in just one statement.
What did Birbal say?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

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

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

What is the end of everything?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Can you solve the below geography rebus by decoding the below rebus ?