What is next number in the pattern below:

131 517 192 123 ?

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

During which month do people sleep the least?

What has a ring but no finger?

What is black when you buy it, red when you use it, and gray when you throw it away?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)