medium · GMAT Quant
In a lab of 150 people, 70 use Device A, 60 use Device B, and 50 use Device C. Exactly 20 use both A and B, exactly 15 use both B and C, and exactly 10 use both A and C. No one uses all three devices.
How many people use at least one of the three devices?
- 115
- 125
- 135
- 145
- 150
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