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

O T T F F S S ?

Replace the question mark with the correct number below.

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Find the hidden tiger in the given optical illusion ?

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?