SOLUTION: By using operation of Set.... in a survey involving 150 different factories it was found that 70 purchased brand A 75 purchased brand B 95 purchased brand C 30 purchased br

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Question 884737: By using operation of Set....
in a survey involving 150 different factories it was found that
70 purchased brand A
75 purchased brand B
95 purchased brand C
30 purchased brand A and B
45 purchased brand A and C
40 purchased brand B and C
10 purchased brand A,B and C
how many factories did not purchased any of the three brands?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
Your numbers don't add up.
70 purchased brand A
30 purchased brand A and B
45 purchased brand A and C
10 purchased brand A,B and C
30+45+10 =85
85> 70
75 purchased brand B
30 purchased brand A and B
40 purchased brand B and C
10 purchased brand A,B and C
30+40+10=80
80 >75
otherwise 25 didn't buy any of the three