What is next number in the pattern below:

131 517 192 123 ?

I am white when I am dirty, and black when I am clean. What am I?

A hen, a dog, and a cat are stolen. Three suspects are arrested named Robin, Steve, and Tim. The police are sure that all of them stole one of the animals but they don't know who stole which animal.

Sherlock Holmes is appointed to identify and is provided with the following statements from the investigation.

Robin - Tim stole the hen
Steve - Tim stole the dog
Tim - Both Robin and Steve are lying. I neither stole a hen nor a dog.

Sherlock is somehow able to deduce that the man who stole the cat is telling a lie and the man who stole the hen is telling truth.

Can you help him find out who stole which animal?

Out of the nine cats that you can see in the picture, there are only two that are completely identical. Can you find them out?

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.

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

There are forty elephants and they have forty-fore heads. How can this be possible?

Find the next number in the series.
1 10 24 43 67 ?

Why is Saturday stronger than Monday?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?