You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

Find the next number in the series.
1 10 24 43 67 ?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

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 ?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?

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

O T T F F S S ?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

A B C D E F G H

These are the letters given to you. Now you have to find out the letter that comes two to the right of the letter which is immediately to the left of the letter that comes three to the right of the letter that comes midway between the letter two to the left of the letter C and the letter immediately to the right of the letter F.