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To do a certain work, the ratio of the efficiencies of A and B is 7:5. Working together, they can complete the same work in  days. A alone will complete 60% of the same work in:
  • a)
    21 days
  • b)
    16 days
  • c)
    15 days
  • d)
    18 days
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
To do a certain work, the ratio of the efficiencies ofAandBis7:5. Work...
Given:
The ratio of efficiencies of A:B=7:5
Work is done by A and B in 1 day
⇒7+5=12
Total work to be completed in 17.5 days
⇒12×17.5
⇒210 units
60% of the Total work completed by A

⇒126 units
'A' will complete the 60% work
⇒126/7
⇒18 days 
∴ 'A' will complete 60% of the work in 18 days.
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To do a certain work, the ratio of the efficiencies ofAandBis7:5. Working together, they can complete the same work indays. A alone will complete60%of the same work in:a)21 daysb)16 daysc)15 daysd)18 daysCorrect answer is option 'D'. Can you explain this answer?
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