Q7. A and b can do a piece of work in 30 days, while b and c can do the same work in 24 days and c and a in 20 days. They all work together for 10 days when b and c leave. How many days more will a take to finish the work?
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total work =( A + B )+( B+C)+(C +A)
= 2(A+B+C)work
= 2× (1/30 +1/24+1/20)
in this way time taken by A will be 11.5 days
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