What is the next number in this series?

4,12,84,3612....

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

Can you find a rabbit in the given picture?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

What am I?

Decode this picture on T-Shirt and tell what it says ?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title