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求PREP-PS-2-193 思路
193.
In a class of 30 students, 2 students did not borrow any books from the library, 12 students each borrowed 1 book, 10 students each borrowed 2 books, and the rest of the students each borrowed at least 3 books. If the average (arithmetic mean) number of books borrowed per student was 2, what is the maximum number of books that any single student could have borrowed?
(A) 3
(B) 5
(C) 8
(D) 13
(E) 15
求思路....
谢谢 |
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