4. A and B can do a piece of work in 12 days, B and C in 15 days and C and A in 20 days. In
how many days will they finish it together and separately?
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4. A and B can do a piece of work in 12 days, B and C in 15 days and C and A in 20 days. In
how many days will they finish it together and separately?
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Step-by-step explanation:
calculate the value of A, B and C