Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

What number do you get when you multiply all of the numbers on a telephone's number pad?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

What four weights can be used to balance from 1 to 30 pounds?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?