What is the next number in this series?

4,12,84,3612....

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

Give it food and it will live; give it water and it will die.

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

In which direction should the missing arrow point?

Three friends named Mr. Black, Mr. Yellow and Mr. Green enter a pub on a weekend night. They are wearing either a Black, Yellow or Green shirt.

Mr. Yellow says to them, 'Did you notice that we all are wearing different color shirts than our names?'

To this, the man who was wearing the Green shirt said. 'Wow, thats right.'

Can you identify who is wearing which colour shirt ?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?