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A seismologist at Caltech is analyzing data from 120 seismic sensors placed along a fault line. If 25% of the sensors detect a tremor within the first 10 seconds, and three times that number detect it within the next 20 seconds, how many sensors have not detected the tremor after 30 seconds?
Total sensors that detect the tremor: 30 + 90 = <<30 + 90 = 120>>120 sensors.
Total accounted for: 12 + 24 = <<12 + 24 = 36>>36 layers.

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