12 men can do a work in 25 days working 6 h per day. In how many days will 36 women do the same task working 5 h per day, if it is given that men are twice as efficient as women?

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  1. 20
  2. 23
  3. 24
  4. 25

Answer (Detailed Solution Below)

Option 1 : 20
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Given:

12 men can do a work in 25 days working 6 hours per day.

36 women need to do the same work working 5 hours per day.

Men are twice as efficient as women.

Formula Used:

Work = Number of people × Efficiency × Number of days × Number of hours

Calculation:

Let the efficiency of a woman be 1 unit of work per hour.

Then, the efficiency of a man is 2 units of work per hour.

Total work done by men:

Work = 12 men × 2 units/man/hr × 25 days × 6 hours/day

Work = 12 × 2 × 25 × 6

Work = 3600 units

Let the number of days required by 36 women be D days.

Total work done by women:

Work = 36 women × 1 unit/woman/hr × D days × 5 hours/day

Work = 36 × 1 × D × 5

Work = 180D units

Since the work done by men and women is the same:

3600 units = 180D units

⇒ 3600 = 180D

⇒ D = 3600 / 180

⇒ D = 20

The correct answer is option 1 (20 days).

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