12 men can complete work in 6 days whereas 10 men and 21 women take 3 days to finish the same work
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man-days to do the job: 6*12 = 72
Each man does 1/72 job per day
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Let women's rate be "w".
3[21w + 10(1/72)] = 1 job
21w + (5/36) = 1/3
21w = (12/36)-(5/36)
21w = 7/36
w = 1/108 job/day
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In how many days can 12 women alone complete the same piece of work?
Solve:
12(1/108)x = 1
Ans: x = 108/12 = 9 days
Each man does 1/72 job per day
---
Let women's rate be "w".
3[21w + 10(1/72)] = 1 job
21w + (5/36) = 1/3
21w = (12/36)-(5/36)
21w = 7/36
w = 1/108 job/day
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In how many days can 12 women alone complete the same piece of work?
Solve:
12(1/108)x = 1
Ans: x = 108/12 = 9 days
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