Can you fill the blank with the correct number?

6 30 870 756030 _____

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

What is the end of everything?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

I look at you, you look at me I raise my right, you raise your left. What am I?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

I can turn polar bears white.
I can make anyone dance.
I can make everyone cry
I can make your hands clap
I can make you thin.
I can make you smile.
I can make you smile

Can you guess the riddle?

I can be cracked, made, told, and played. What am I?