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

O T T F F S S ?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

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

Can anyone tell me a word in the English dictionary which has a silent 'z'?

What is the Surname of Barbie Doll?

An ape is trying to climb on a pole that is 60 feet high. Due to the slippery surface, the ape climbs 3 feet in a minute only to slip back 2 feet.

How much time do you think the monkey will take to reach the top of the pole?

I always drive my customer away.

Who am I?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Can you find the 09 errors in the picture below?