M, N, and O can do work in 22, 24, and 16 days respectively. If they work for a day alternately such that M works on the first day, N works on the second day, O works on the third day and then again M works on the fourth day and so on, then in how many days approximately, the work will be completed? 

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SSC GD Constable (2022) Official Paper (Held On : 02 Feb 2023 Shift 3)
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  1. 17 days
  2. 20 days
  3. 16 days
  4. 19 days

Answer (Detailed Solution Below)

Option 2 : 20 days
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Detailed Solution

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Given:

M, N, and O can do work in 22, 24, and 16 days respectively

Solution:

Work done by M in one day = 1/22

Work done by N in one day = 1/24

Work done by O in one day = 1/16

Total work done in one cycle of three days = (1/22) + (1/24) + (1/16)

Total number of days to finish the work = 3/((1/22)+(1/24)+(1/16))

⇒ Total days = 3/(0.045 + 0.0417 + 0.0625)

⇒ Total days = 3/0.1492

⇒ Total days = 20.1 days

Therefore, the work will be completed in approximately 20 days.

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