What is black when you buy it, red when you use it, and gray when you throw it away?
Take 9 from 6, 10 from 9, 50 from 40, and leave 6.
How Come ??
How many triangles can you find in this given picture?
What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?
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 ?
Spot the cat in the picture below
John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?
But it is quite possible, do you know how?
Find the missing number in the sequence below:
Can you write down eight eights so that they add up to one thousand?
There are a hundred statements.
First person says: At least one of the statements is false.
Second person says: At least two of the statements is false.
Third person says: At least three of the statements are false.
Fourth person says: At least four of the statements are false.
Hundredth person says: At least a hundred of the statements are false.
Analysing it, how many statements do you think are false and how many are true?
In 2011, people playing Foldit, an online puzzle game about protein folding, resolved the structure of an enzyme that causes an Aids-like disease in monkeys. Researchers had been working on the problem for 13 years. The gamers solved it in three weeks.