If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

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.

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Solve the following series:
AZ, GT, MN, __, YB

Can you solve the rebus below?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

Which part of London exists in France as well ?

People make me, save me, change me, raise me. What am I?