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

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

Can you solve below mathematical equation?

2^1234 - 2^1233

10+10 and 11+11 can give you the same answer.

Explain how?

What 5-letter word typed in all capital letters can be read the same upside down?

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

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

Can you count the number of lines in the below picture?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?