There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Why do you find that most of the buildings are deprived of the 13th floor?

How can one talk without saying a single word?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

Why is it very easy to weigh a fish?

What goes through cities and fields, but never moves?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?