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     EduGorilla 
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    A certain hotel has 1,400 single rooms and 420 double rooms. Only one person is required to clean each room at one time. One person can clean a single room in 15 minutes and a double room in 20 minutes. If each person works for exactly 7 hours, how many persons are needed to clean all the rooms?

    Options :-

    1. 65
    2. 70
    3. 80
    4. 90
    5. 265
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