Question: thabo owns exactly 180 books , and each book is either paperback fiction , paperback nonfiction , or hardcover nonfiction . if he owns 20 more paperback nonfiction books than hardcover nonfiction books , and twice as many paperback fiction books as paperback nonfiction books , how many hardcover books nonfiction books does thabo own ?
A) 10
B) 20
C) 30
D) 40
E) 50
Correct answer: c
Grade: 6 | Topic: Expressions and Equations | Difficulty: Hard | Standard: 6.EE.B.6