If eleven plus two equals one, what does nine plus five equal?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

In the picture given below, can you find out which digit will take place of the question mark?

Find the Goldfish below the given Image.

Find the next number in the series.
1 10 24 43 67 ?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

Find the next number in the series below

21 32 54 87 131 ?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

I travel all around the world but always stay in the corner. What am I?

The centre of the third figure is empty. What digit should fit inside?