Question

9. A and B can do a piece of work in 12 days. B and C in 15 days, and A and C in 20 days. Find the number of days
in which all working together will complete the work.
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Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Step-by-step explanation:

(A+B)'s one day work = 17

B's one day work = 114

= 17−114=2−114=114

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