What is next number in the pattern below:

131 517 192 123 ?

How many times can you subtract the number 5 from 25?

Find the hidden tiger in the given optical illusion ?

The Little ant seems to be always confused. Do you know why?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

What number when divided in half becomes zero?

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

I drive at an average speed of 30 miles per hour to the railroad station each morning and catch my train. On a particular morning, there was a lot of traffic and at the halfway point, I had averaged only 15 miles per hour. How fast must I drive for the rest of the way to catch my train?