hard · GMAT Quant
An airline safety system evaluates 160 engines for sensor alerts: oil pressure, vibration, and temperature. Oil pressure alerts occurred on 85 engines, vibration alerts on 70, and temperature alerts on 60. Exactly 15 engines had no alerts across these three systems, and 10 engines had alerts across all three systems.
How many engines had alerts in exactly one system?
- 85
- 50
- 75
- 115
- 95
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