SSC Government Jobs Exams Numerical Ability Time and Work

A and B can do a piece of work in 12 days. B and C can do it in 20 days. If A is twice as good a workman as C, then in what time will B alone do it?

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SSC Other Question

A and B can finish a work in 12 days. B and C can finish the same work in 18days. C and A can finish in 24 days. How many days will take for A, B and Ccombined together to finish the same amount of work? A contractor undertook to do a piece of work in 125 days and employs 175men to carry out the job, but after 40 days, he finds that one a quarter of thework had been carried out. How many more men should be employed tofinish the work in time?