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In this high school mathematics question, the concept of man-hours is used to determine how long it would take 12 people to build a wall based on the time taken by 16 people. The correct answer is 6 hours.
To solve this problem, we use the concept of man-hours. If 16 people build a wall in 4 hours, that's a total of 16 * 4 = 64 man-hours. So, the 12 people would need 64 / 12 = 5.33 hours to complete the same wall. Since we can't have a fraction of an hour, the answer is 6 hours.
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