What is the next number in this series?

4,12,84,3612....

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

What does this Rebus Picture mean?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

Rumel, A detective who was mere days from cracking an international smuggling ring has suddenly gone missing. While inspecting his last-known location, you find a note:

710 57735 34 5508 51 7718

Currently, there are 3 suspects: Bill, John, and Todd. Can you break the detective's code and find the criminal's name?

Count the number of triangles in the picture below:

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What do you answer even though it never asks you questions?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?