What is the next number in this series?

4,12,84,3612....

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

Make a sentence consisting of three words that have the whole alphabet.

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

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?

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Can you identify the hidden rebus in the image below?