Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

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.

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

What's the best place to go shopping in the ocean?

The chance of Mr John winning the lottery is 10%. All participants lined up and Mr John is 4th in the row. The first three participants lose the lottery.

What is the chance of Mr John now?

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

What goes up but never comes down?

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?

Can you identify the famous TV character from the rebus below?