[点此查看答疑][OG]Problem Solving
为什么我算不出解[img=/resource/2020-08/16895-1598524651.jpg]
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Problem Solving
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题目：
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?
选项:
A、10
B、20
C、30
D、40
E、50
答案:
B
Problem Solving
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[点此查看答疑][OG]Problem Solving
这个TT图怎么画？
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[点此查看答疑][OG]Problem Solving
为什么hardcover fiction是0，没有想通是怎么判断的
