Good Riddles

Question: A jungle is 4 miles wide. A blind boy wants to see how far he can walk into the jungle.

How far could he possibly go into the jungle?

Question: What type of cheese is made backwards?

Question: I can go up a chimney down but not down a chimney up?

What am I?

Question: When warm my house expands and when cold it contracts,
I am vital to a certain type of pact.

What am I?

Question: If 1+1=4, 7-3=2, and 5x2=8, then what is half of 19?