Data Sufficiency
试题详情
题目：
A total of 100 customers purchased books at a certain bookstore last week. If these customers purchased a total of 200 books, how many of the customers purchased only 1 book each?
(1) None of the customers purchased more than 3 books.
(2) 20 of the customers purchased only 2 books each.
选项:
答案:
C
