What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

I know a nine-letter word having only one vowel.
Do you ?

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?

If eleven plus two equals one, what does nine plus five equal?

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

What has one letter and starts with an E?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

How can you take 2 from 5 and leave 4?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?