What is the coolest letter in the alphabet?

Using Only Five 5's and any mathematical operator make sum as 37

What English word has three consecutive double letters?

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

I have feet, but no legs. Which animal Am I?

Find out the number of circles in the given picture having Illusion

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?

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

? : 3839 :: 11 : 1209