Twelve identical workers, working independently at a constant rate, can complete a fixed task in 15 days. How many workers are needed to complete it in 10 days? Enter the number of workers.

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The task contains 12 times 15, or 180 worker-days, so a 10-day schedule requires 180 divided by 10, which is 18 workers. Scaling the workforce down to 8 because the time was reduced would use direct proportion and leave too little labour for the fixed task.