教授, 请帮我看看这道题吧, 是不是题有问题呀? 谢谢先 :)

来源: 于 2012-02-12 07:22:46 [旧帖] [给我悄悄话] 本文已被阅读：次

 Problem of the Week

In grade 11, science students can select a course in Physics, Biology or Chemistry. 18 selected Physics, 32 selected Biology, and 25 selected chemistry. Of these, 16 chose both Biology and Chemistry, but only 7 chose both Physics and Chemistry and only 8 selected both Physics and Biology. Just 3 selected to take all three courses. How many science students are there all together?

请您看看答案是  38, 还是 41