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Mathematics, 20.09.2020 08:01 jackfrost5

Working together, Sam and Charlie can change all the light bulbs in the office building in 3 hours. It would have taken Charlie 8 hours to do the job alone. Which equation can be used to solve for the rate, r, for Sam to change all the light bulbs in the office building by himself?

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Working together, Sam and Charlie can change all the light bulbs in the office building in 3 hours....
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