I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

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.

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

What does this rebus mean?

O
N
C
E
TIME

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

How do you go from 98 to 720 using just one letter?

What jumps when it walks and sits when it stands?

What does below pictogram mean?

What building has the most stories?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?