Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

How many times can you subtract the number two from the number fifty?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

I don't get anymore wetter, no matter how much rain falls on me.

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

I make two people out of one. What am I?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

During which month do people sleep the least?