Replace the question mark with the correct number in below Picture:

Prove that twice of ten is the same as twice of eleven.

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

A man was going to bleach his socks because they had gotten muddy the day before. As he was pouring the bleach into the washing machine, he spilt some on the floor. He got some cleaning fluid and mopped it up with a rag. Minutes later he was dead. What killed him?

What happened when the wheel was invented?

Can you find a rabbit in the given picture?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

What is the next number in the series?

15 29 56 108 208 ?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

What's a single-digit number with no value?