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     EduGorilla 
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    A is two times as efficient as B and three times as efficient as C. If it takes 20 days for B and C together to finish a piece of work, how many days will all three of them working together take to finish the piece of work?

    Options :-

    1. 9
    2. 9
    3. 10
    4. 10
    5. 12
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