A group of 5 men or 12 women can complete a particular task in 78 days. How long will it take for 5 men and 12 women working together to finish the same task?

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Kerala PSC Common Preliminary Exam (GRADUATE LEVEL) PYP - 2025 (held on 24th May 2025)
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  1. 44
  2. 39
  3. 36
  4. None of these

Answer (Detailed Solution Below)

Option 2 : 39
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Given:

5 men can complete a task in 78 days.

12 women can complete the same task in 78 days.

Formula used:

If M1 persons can do a work in D1 days, and M2 persons can do the same work in D2 days, then M1D1 = M2D2.

Also, Work = Efficiency × Time

Calculations:

5 men ≡ 12 women

5 men and 12 women:

Total equivalent men = 5 men (from the group of men) + 5 men (equivalent to 12 women)

⇒ Total equivalent men = 10 men

We know that 5 men can complete the task in 78 days.

Let D be the number of days 10 men will take.

Using the formula M1D1 = M2D2:

5 × 78 = 10 × D

⇒ D = (5 × 78) / 10

⇒ D = 78 / 2

⇒ D = 39 days

∴ It will take 39 days for 5 men and 12 women working together to finish the same task.

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