medium · GMAT Quant
In a survey of 150 residents, 60 read Journal A, 55 read Journal B, and 50 read Journal C. Exactly 20 read both A and B (including those who also read C), exactly 15 read both B and C, and exactly 25 read both A and C. Altogether 120 residents read at least one of the three journals.
How many residents read all three journals?
- 5
- 10
- 15
- 20
- 25
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