Replace the question mark with the correct number.

What is next number in the pattern below:

131 517 192 123 ?

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?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?