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?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Which Travels Faster? Solve below famous picture riddle:

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.

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

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

Imagine you are in a room with no windows or doors. How will you get out?

Through your logical capabilities, can you make 7 an even?

A blonde put eyeliner on her head. Why?