There was a strange boy who was born before his father. How can this be possible?

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

I am an odd number. Take away a letter and I become even. What number am I?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

There is something which you can be arrested for attempting but not for successfully completing.

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Find the smallest sentence with all the English alphabet.