Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

Can you place three balls such that the equation shown in the picture holds true?

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

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

There is a jar in which there are two types of candies.
20 blueberries and 16 strawberries. You perform the following steps:
1) You take out two candies.
2) If the two candies are of the same flavour, you add a blueberry one otherwise, you add the strawberry one.

You repeat these two steps till there is just one candy remaining in the jar. Which flavoured candy will be left?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

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?