Given the rationale, provide a reasonable question and answer. Step-by-step reasoning process: The park is 2,000,000 square feet because 1000 * 2000 = 2,000,000. Thus, there are 100,000 trees in the park because 2,000,000 / 20 = 100,000.
 The question and answer:
A park is 1000 feet long and 2000 feet wide. If there is 1 tree per 20 square feet, how many trees are there in the park?
The answer is 100000