Long Riddles and Answers

Question: can you make an equation by using only the no.-4,4,4,4 whose answer will be 20.

Question: I have no wings but I fly,
I have no teeth but I bite.

What am I?

Question: Before man discovered Mt. Everest, what was the tallest mountain in the world?

Question: If you have a cake, how many pieces of cake can you form with 3 straight cuts?

Question: A man gave one son 10 cents and the other 15 cents.

What time was it?