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26-05-2017
Mathematics

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8. Mark can clean his father's office in 30 minutes. His younger sister Lynn can clean the office in 40 minutes. How long will it take the two of them together to clean the office?

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trishinada63 trishinada63

26-05-2017

Use the average formula to answer the question. So 30+40=70. Divide 70 by 2, which is 35.

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