Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?

These types of puzzles are known as charades. What you have to do is to find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be the 'office'.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.

How can a man go eight days without sleep?

Why is the longest human nose just 11 inches?

What has 13 hearts but no other organs?

Which tank will fill first?

Imagine you are in a room with no windows or doors. How will you get out?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

A man dies of old age on his 25 birthday. How is this possible?