medium · GMAT Quant
A logistics management software system flags an automated delivery vehicle's battery drain rate r, expressed in percentage points per hour, whenever |3r - 21| > 12.
Which of the following mathematical conditions describes all values of r that trigger a flag by the system?
- 3 < r < 11
- r ≤ 3 or r ≥ 11
- r < 3 or r > 11
- r > 11
- r < 31
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