A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

Out of four images which one is the odd one out?

Why did the Girl throw the butter out of the window?

What does this mathematical rebus means ?

In the given picture, you can find two letters missing. When two particular letters are placed in the missing spots, you get an eight-letter word while reading in the anti-clockwise direction. Can you find out the missing letters and the missing word eventually?