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A radar is designed to report the track of an aircraft every second. If this radar reports 30 tracks in one minute, what percentage of the time did the radar track the aircraft?

25%

The radar is designed to report the track of an aircraft every second. If it reports 30 tracks in one minute, that means it tracked the aircraft for 30 out of 60 seconds, or 30/60 = 1/2 = 0.5 = 50% of the time. Option A, 25%, is incorrect because that would imply that the radar only reported 15 tracks in one minute, which is half of the actual reported number. Option B, 30%, is also incorrect because that is the same number of tracks as reported, not the percentage of time. Option D, 75%, is incorrect because that would imply that the radar reported 45 tracks in one minute, which is 15 more tracks than actually reported. Therefore, the correct answer is Option A, 50%.

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30%

50%

75%

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