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P and Q can together do a work in 6 days. If P can do the work alone in 18 days, then P is:
  • a)
    As efficient as Q
  • b)
    Half as efficient as Q
  • c)
    Twice as efficient as Q
  • d)
    Thrice as efficient as Q
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
P and Q can together do a work in 6 days. If P can do the work alone i...
P’s 1 day work = 1/18
(P + Q)’s 1 day work = 1/6
Q’s 1 day work = 1/6 – 1/18 = 1/9
Hence, Q can alone do the work in 9 days
∴ P is half as efficient as Q
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P and Q can together do a work in 6 days. If P can do the work alone in 18 days, then P is:a)As efficient as Qb)Half as efficient as Qc)Twice as efficient as Qd)Thrice as efficient as QCorrect answer is option 'B'. Can you explain this answer?
Question Description
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