What is next number in the pattern below:

131 517 192 123 ?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

What occurs twice in a week, once in a year but never in a day?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

What is the centre of gravity?

What does the below image rebus riddle means ?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

In the image given, you can find several triangles. Can you count them all?