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

O T T F F S S ?

A man always keeps a spare tyre in his car. To make full use of all the five tyres, he changes the tyres in a manner that for a distance of 1, 00,000 km, each of them runs the same distance.

Can you calculate the distance travelled by each tyre on that journey?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

Why is the Hole below a Lock?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

A pack of cards has 40 cards. You are blindfolded. Out of 40, 25 cards are facing down while 15 are facing up. You have been asked to divide this pack of cards into two decks - so that each deck contains an equal number of face-up cards. Remember, you are blindfolded.

How will you do it?

You have a thousand Re. 1 coins with you. You have ten bags with you and you can put any number of coins in each of the bags. The condition is that if someone asks you for any amount between 1 and 1000, you must be able to give that amount by just giving the bag (you are not allowed to open the bag and give coins).

How will you do it?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?