Can you fill the blank with the correct number?

6 30 870 756030 _____

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

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

There is something which is always coming but never arrives?

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

What can you see in the middle of March and April that you can never see in any other month?