Can you make four (4) nines (9) equal 100?

John was writing his first book. After saving the document, he locked his laptop with a password and mentioned some phrases for the hint box.

A friend of his tried opening his laptop but found out that it was password protected. Following is the hint that appeared.
1 mobile 3 books 2 roars 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches.

Can you help him in cracking the password?

Why did the Girl throw the butter out of the window?

How many times do a clock's hands overlap in a day ?

There is something which you can be arrested for attempting but not for successfully completing.

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

How many times in a given day, minutes and hour clock comes in a straight line ?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

I am quite hot but become too cold if you remove the first two letters. What am I?