Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

An office is divided into 8 cubicles. How many of the cubicles are painted if only 1/8 of the cubicles are painted?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

What makes this number unique: 8,549,176,320?

The more of this there is, the less you see. What is it?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

Can you find the thief by just looking at the picture below?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?