What is the word or phrase?

Can you find out the number that should replace the question mark with a valid reason?

What has hands, but can’t clap?

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.

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
**Hint: It is a Number Series Puzzle

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Find the smallest sentence with all the English alphabet.

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

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your