What is next number in the pattern below:

131 517 192 123 ?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.Can you place 8 queens on the board in a manner that none of the queens can attack each other?

Why is a river so rich ?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Can you name an animal whose killing cannot be performed without spilling your own blood?

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

Why is the Hole below a Lock?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?