A receptionist typed 8 memos, each either 1 or 2 pages long. If the receptionist

游客2024-01-12  20

问题 A receptionist typed 8 memos, each either 1 or 2 pages long. If the receptionist typed 12 pages in all, how many of the memos had 2 pages?

选项 A、1
B、2
C、3
D、4
E、5

答案 D

解析
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