Can you replace the question mark with the correct number?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho

Why is a river so rich ?

Move three sticks of the spiral below to form a square.

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

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

Find the last number in the series below:

voN luJ yaM raM ---

Can you make four (4) nines (9) equal 100?