Can you fill the blank with the correct number?

6 30 870 756030 _____

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

I make two people out of one. What am I?

Can you name four days which start with the letter 'T'?

When it is alive we sing, when it is dead we clap our hands. What is it?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

Name a key which is hardest to turn.

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?