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.

Which digit occurred maximum times between the number 1 and 1000?

What English word has three consecutive double letters?

Why Aeroplane windows are round?

Be active and find the killer in the picture Riddle below.

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

Can you find out the missing number in the grid?