Good Riddles

Question: I am both black and white. I go with the flow and my loyalty never wavers.

Question: Find the five digit number in which the first digit is one half of the the 4 fourth digit, the second digit is one fourth of the last digit, the fourth digit is 3 times the second digit, and the third digit is the first digit plus 4.

Question: I can be shared by many or spread to few, I am as fragile as silk yet as strong as steel. Wars have been fought in my name, generations defined by me. What am I?

Question: what have holes but you will see it on the street ?

Question: There is a wood house and a brick house that was on fire at the same time. Which house would the ambulance come to first.