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题目内容
Thabo owns exactly 140 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 nonfiction books does Thabo own?
答案：B
专业教师答疑
问题：为什么hardcover fiction是0，没有想通是怎么判断的 查看答疑
问题：为什么我算不出解 查看答疑
问题：这个TT图怎么画？ 查看答疑

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