What is next number in the pattern below:

131 517 192 123 ?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

Which Burger Is Different in below image?

Replace the question mark with the correct number.

My location can be determined by the below rebus.
So where am i ?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

Solve this riddle by finding the odd one out from the rest.

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?