A project can be completed by 5 workers in 24 days. How many workers are needed to finish the project in 15 days? The time to complete a project is inversely proportional to number of people who are doing the project.

Because the time is inversely proportional to the number of workers, the total amount of work stays constant. The project requires 5 × 24 = 120 worker-days, so finishing it in 15 days takes 120 ÷ 15 = 8 workers. The correct choice is 8 workers.

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