How many words can a pen with half refill write?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

What is the difference between a jeweller and a jailer?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

A generous owner of a company decided to give a bonus of $45 to every man and $60 to every woman on his birthday. But only one-ninth of the men and one-twelfth of the women were present to take the bonus.

Can you calculate the amount of money the owner spent if there were 3552 employees?

What happened when the wheel was invented?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.