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.

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?