What is the next number in this series?

4,12,84,3612....

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

John was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday.

Can you find out on what day was Jacob born?

How many runs at maximum can a batsman score in a normal one-day match? Consider the fact that the conditions are ideal and there are no No Balls, no Wide Balls and no Extras in that match.

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

A man is found hanging dead from the ceiling of a room. The room’s dimensions are 15 x 15 x 15. The man is only 6ft tall and the rope was only 2ft long. There are no windows and only one door to the room. The door is bolted shut from the inside, and a puddle of water is under the man. How did he kill himself?

What is the end of everything?

How many bananas can you eat if your stomach is empty?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

There is a place where if I stand up straight, I will still be considered sideways.