There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Solve the following series:
AZ, GT, MN, __, YB

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

Which country gets ill every time?

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

An ant is travelling on a 1-meter-long rope at 1 cm/second but also the entire rope is being stretched by an extra 1 meter/second. Is it possible for the ant to reach at the end of the rope?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?