A job needs 1,500 worker-hours. On day 1, 10 workers work 8 hours; each later day 2 more workers join, all working 8 hours. On which day is the job finished?

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Accepted Answer

Day 10. Daily hours: 80, 96, 112, …, rising by 16. After 9 days: 1296. Day 10 adds 224, passing 1500.

A job needs 1,500 worker-hours. On day 1, 10 workers work 8 hours; each later day 2 more workers join, all working 8 hours. On which day is the job finished?

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