2. 外语
  3. In one day at a library, 64 people borrowed books. Twice as many people borrowed only a thriller as borrowed only a science fict

In one day at a library, 64 people borrowed books. Twice as many people borrowed only a thriller as borrowed only a science fict

admin2011-03-04  100
问题 In one day at a library, 64 people borrowed books. Twice as many people borrowed only a thriller as borrowed only a science fiction book. Three people borrowed a biography only and 11 people borrowed both science fiction and a thriller, but not a biography. The same number borrowed a biography and a thriller but no science fiction as borrowed one of each of the three types. Twenty-one people did not borrow a thriller. One more person borrowed a science fiction book and a biography book than borrowed a biography only.
How many people borrowed a thriller only?
选项
答案28 people borrowed a thriller only．
解析 (设三种书都借的人数为x， 那么既借传记又借惊险小说的人数也为x；设既借传记又借科幻小说的人数为y；设只借科幻小说的人数为z，那么只借惊险小说的人数为2Z。根据题意可知：y=4；y+z+3=21；3Z+2X+y+11+3=64，故求出z=14，2Z=28．)
转载请注明原文地址:https://www.kaotiyun.com/show/q78K777K
本试题收录于： A类竞赛（研究生）题库大学生英语竞赛（NECCS）分类
0

A类竞赛（研究生）

大学生英语竞赛（NECCS）

相关试题推荐
随机试题
最新回复(0)