Answer this question:John starts at an elevation of 400 feet. He travels downward at a rate of 10 feet down per minute for 5 minutes. What is his elevation now?
He traveled down 10 * 5 = 50 feet. So he is at an elevation of 400 - 50 = 350 feet.
The answer is 350.

Answer this question:There were 50 fish in a pond and 3 times as many tadpoles. If Curtis catches 7 fish and half the tadpoles develop into frogs, how many more tadpoles than fish are there in the pond now?
There were 50 x 3 = 150 tadpoles. There are 50 - 7 = 43 fish left in the pond. There are 150 / 2 = 75 tadpoles left in the pond. There are 75 - 43 = 32 more tadpoles than fish in the pond now.
The answer is 32.

Answer this question:A married couple and their 6 children are ordering some pizza. If the couple want 3 slices each and the children want 1 slice each, how many 4-slice pizzas should they order?
The couple want 3 slices each for a total of 2 * 3 = 6 slices. The children want 1 slice each for a total of 1 * 6 = 6 slices. They want 6 + 6 = 12 slices in total. Each pizza has 4 slices so they need 12 / 4 = 3 pizzas.
The answer is 3.

Answer this question:A class has 500 tables and 2/5 times as many books as the number of tables in the class are on top of each table. What's the total number of books in the class?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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If there are 2 / 5 times as many books as the number of tables in the class on top of each table, there are 2 / 5 * 500 = 200 books. Since the class has 500 tables with 200 books on top of each, there are 500 * 200 = 100000 books.
The answer is 100000.