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

O T T F F S S ?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

The following question it puts forth you:

25 - 55 + (85 + 65) = ?

Then, you are told that even though you might think it's wrong, the correct answer is actually 5!

Whats your reaction to it? How can this be true?

Can you find out who is the kidnapper in below Picture and why, Explain ?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

In a basket of apples,
when counted in twos, there was one extra
when counted in threes, there were two extra when counted in fours, there were three extra
when counted in fives, there were four extra
when counted in sixes, there was five extra.

However, if the apples were counted in sevens, no extra apple was left. Can you calculate the minimum number of apples that were present in the basket?

what's the probability of getting a king or a queen from a pack of 52 cards?

Which Travels Faster? Solve below famous picture riddle: