People make me, save me, change me, raise me. What am I?

How many letters are in the alphabet?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

If a wheel has 54 spokes, how many spaces are there between the spokes?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

A monk has a very specific ritual for climbing up the steps to the temple. First, he climbs up to the middle step and meditates for 1 minute. Then he climbs up 8 steps and faces east until he hears a bird singing. Then he walks down 12 steps and picks up a pebble. He takes one step up and tosses the pebble over his left shoulder. Now, he walks up the remaining steps three at a time which only takes him 9 paces. How many steps are there?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?