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A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is?
  • a)
    1/10
  • b)
    1/4
  • c)
    7/15
  • d)
    8/15
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A can do a work in 15 days and B in 20 days. If they work on it togeth...
A can do a work in 15 days and B in 20 days.
A’s 1 day’s work = 1/15.
B′s 1 day′s work = 1/20
(A+B)’s 1 day’s work = (1/15 + 1/20) = 7/60.
(A+B)’s 4 day’s work= (7/60 × 4) = 7/15.
Remaining work= (1-7/15) = 8/15.
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A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is?a)1/10b)1/4c)7/15d)8/15Correct answer is option 'D'. Can you explain this answer?
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