A can do a piece of work in 20 days, B in 30 days and C in 40 days . They start working together. A works for 2 days and leaves B leaves 4 days before the work finishes. How long does the work last
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Answer:
Work done by (A+B) in 2 days =(
20
1
+
40
1
)=
40
3
40
3
of the work is done by (A+B) in 2 days
∴ Whole work is done by (A+B) in 2×
3
40
days =
3
80
days =26
3
2
days
∴ Work will be completed on 27th day.
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