What is next number in the pattern below:

131 517 192 123 ?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

When 99 is considered higher than 100?

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

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Can you find the 09 errors in the picture below?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

One night, a man runs away from home. He turns left and keeps running. After some time he turns left again and keeps running. Later, he turns left one more time and runs back home—but when he gets home, he finds a man in a mask. Who was the man in the mask?

If an electric train is travelling south, then which way is the smoke going?