Can you fill the blank with the correct number?

6 30 870 756030 _____

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

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.

Tell me the Hindi name of a Vegetable which if we remove 1st word will become a precious Stone and by removing the last word it will become a sweet eatable.

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

why number 8549176320 is one of a kind?

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

What can go up a chimney down, but can’t go down a chimney up?

What has 88 keys?