SOLUTION: For homework I got given a sheet of data. In this sheet of data, there were two surveys that were completed by a group of year 8 students. Of these students, 84 of these students

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Question 778812: For homework I got given a sheet of data.
In this sheet of data, there were two surveys that were completed by a group of year 8 students. Of these students, 84 of these students completed the first survey, while 81 of the same students completed the second.
How do I find how many students completed both surveys?
Answer by psbhowmick(878) About Me  (Show Source):
You can put this solution on YOUR website!
You will need to use Set Theory. Send me the sheet of the data and I will help you.