What is next number in the pattern below:

131 517 192 123 ?

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.

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

You see me once in June, twice in November, and not at all in May. What am I?

Can you find out which options fits best with the missing column?

The centre of the third figure is empty. What digit should fit inside?

A sundial has the fewest moving parts of any timepiece. Which has the most?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

What is the largest number you can write with just 3 digits?