###Human: 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?, ### Assistant: 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. 
 So the answer is :  100000