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If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work?

40 30 45 60

  • Vaishali
  • 10541 Views
  • 211 Answers
  Answer
211 Answers

  • 60

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  • A +B = 15 daysbr /B alone = 20 days ( taking LCM of 15 n 20 the rate per day of A n B toghether is 4 while that of B alone is 3, so A's rate per day is 4-3 = 1)br /therefore, A alone will take 60 days to complete the work.

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  • 60 days

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  • 60 days

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  • 60

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  • 60

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  • 60

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  • (15*20)/(20-15)=60 days A alone can do a work

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  • 1/a+1/20=1/15 1/a=1/15-1/20=1/60 thus a takes 60 days

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  • 60

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