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A, B and C together can complete a piece...

A, B and C together can complete a piece of work in 10 days. All the three started working at it together and after 4 days A left. Then B and C completed the work in 10 more days. A alone could complete the work in : a. `15` days b. `16` days c. `25` days d. `50` days

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RS AGGARWAL-TIME AND WORK-All Questions
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