Question

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Answer 1

Step-by-step explanation:

The answer is exact 7 days.

A leaves 5 days before completion of work.

B leaves 2 days after A.

It means, C has worked alone for 3 days to complete the job.

Now C does the entire work in 15 days.

So, C will finish (1/5)th or 20% of the total work in 3 days.

So, before both A & B had left, 80% work was already done.

Now, it's mentioned that B has left 2 days after A. This means that B & C have worked together for 2 days.

For (B+C) as a team, they finish (9/60) part of the work in 1 day. So, in 2 days, they would have finished (18/60) parts of the total job. THIS figure when converted to % yields 30%.

18/60 = 3/10.

So, 30% work is done by (B+C) team.

So,(A+B+C) team completes 50% of the work for which they take 2 days full.

So, 2+2+3 = 7 days.

Answer 2

Step-by-step

✳Answer✳

✳2 + 2 + 3 = 7✳

✳7 days✳