If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Why is a river so rich ?

I travel all around the world but always stay in the corner. What am I?

What has to be broken before you can use it?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

I shave every day, but my beard stays the same. What am I?

How many letters are in the alphabet?