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? Think carefully first, then make a decision:
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.