Can you fill the blank with the correct number?

6 30 870 756030 _____

A pack of cards has 40 cards. You are blindfolded. Out of 40, 25 cards are facing down while 15 are facing up. You have been asked to divide this pack of cards into two decks - so that each deck contains an equal number of face-up cards. Remember, you are blindfolded.

How will you do it?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

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

What Adam and Eve do not have but the rest of the people have?

An explorer goes on an exposition in the jungle. He sets up camp in the middle of the jungle. The next morning he sees something with a head and a tail, but he is not afraid. What did he see in his bag?

What has many keys but can’t open a single lock?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

What does the below mathematical rebus mean?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?