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Please Help

 
 
Picture of Candace Ketsa
Please Help
by Candace Ketsa - Wednesday, 20 February 2013, 1:35 PM
 

This question is #8 on Page 20 of the Nelson Workbook.  Can someone please tell me how to do this. 

At a university, 339 first year students need to think about which option to take in their second year.

20 students are interested in teaching only.

183 students are interested in computer science

194 students are interested in finance

________ students are interested in computer science only

________ students are interested in finance only.

________ students are interested in computer science and finance.

Not a clue what to do. 

 
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Picture of Debby Sumantry
Re: Please Help
by Debby Sumantry - Wednesday, 20 February 2013, 2:24 PM
 

Is it possible that there are only 2 overlapping circles and that teaching is a separate circle?  Then 339-20=319, the total of the other two circles.  183+194=377.    377-319=58, the overlap of computer science and finance.  I don't have the workbook in front of me so I don't know if I'm missing some info.

 
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Picture of Candace Ketsa
Re: Please Help
by Candace Ketsa - Wednesday, 20 February 2013, 3:11 PM
 

No that is exactly how it is in the workbook.  I thought about that as well, but that is a huge assumption.

 
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Picture of Heidi McInnes
Re: Please Help
by Heidi McInnes - Wednesday, 20 February 2013, 3:16 PM
 

I was able to get 58 for the intersection of Comp. Science and Finance.

The answers they give for CS only = 125 and Finance only = 136 (but this represents only for a two-ring Venn Diagram). 

I managed to get those numbers... but I couldn't place them/go any furthur with the info they give.

so to answer your question... I can't get it either.   

 
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Picture of Daniel Haggerty
Re: Please Help
by Daniel Haggerty - Wednesday, 20 February 2013, 4:54 PM
 

Since 20 students are interested in teaching only, they are a group onto themselves (they are independent) 

This means that 319 students are interested in comp science and finance.

 

183 + 194 = 377 students total (too many, we are only dealing with 319) so there are some students who are interested in both. 377 - 319 = 58 

58 students are interested in both com sci and finance. I'll subtract these from the totals...

183 - 58 = 125 in comp. sci. only

194 - 58 = 136 in finance only

 

As a check, 125 + 136 +58 = 319 + 20 = 339

 
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