Question

A, B, and C can do a work in 20, 45, and 120 days,
respectively. They started the work. A left 10 days
before and B left 5 days before the completion of
work. In how many days is the total work completed?​

Answer 1

Answer:

Let the work be completed in N-days.

So (N-10)/20 + (N-5)/45 + N/120= 1

So (N-10)18 + (N-5)8 +3N=360

29N= 580

So N= 20

Therefore the whole work was completed in 20- days.

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