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Mathematics, 03.08.2020 14:01 Violinartist7267

A painter can paint a building in 15 days and a coworker can do the same job in 10 days. If the first painter starts and 3 days later the coworker joins in to help finish the job, how many days does it take to paint the building?

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A painter can paint a building in 15 days and a coworker can do the same job in 10 days. If the firs...
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