I want to know the answer to the following question:
How many Fortune 500 companies are based in Oklahoma?
All the background I'm provided with is that "Four Fortune 500 companies and six Fortune 1000 companies are headquartered in Oklahoma, and it has been rated one of the most business-friendly states in the nation, with the 7th-lowest tax burden in 2007.". Is that enough to answer the question?
Answer: yes