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?

Which Travels Faster? Solve below famous picture riddle:

What is the word or phrase?

A man dies of old age on his 25 birthday. How is this possible?

You have two bottles of pills marked with labels A and B. The pills are identical. The doctor has asked you to take one A pill and one B pill daily. You cant take more or less than that.

While taking out the pills one day, you took out one pill from A and by mistake took out two from B. You have no idea which pill is which now.

You cant throw away the expensive pills. What will you do now?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

Consider this about a word: The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?