What is next number in the pattern below:

131 517 192 123 ?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Remove two matchsticks to make the below equation correct.

If you paint a brown house white it will become a white house. If the stoplight changes from red to green, then the light is green. So, if you throw a white shirt into the Red Sea, what will it become?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

What number comes next in the series?

5 15 5 18 5 24 14 20 _

I have feet, but no legs. Which animal Am I?

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

Can you count the number of triangles inside a triangle?