What is next number in the pattern below:

131 517 192 123 ?

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

What English word has three consecutive double letters?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Can you find the 09 errors in the picture below?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

There are a hundred statements.

First person says: At least one of the statements is false.

Second person says: At least two of the statements is false.

Third person says: At least three of the statements are false.

Fourth person says: At least four of the statements are false.

..

..

..

Hundredth person says: At least a hundred of the statements are false.

Analysing it, how many statements do you think are false and how many are true?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

What is more useful when it is broken?