This question was previously asked in

Official Soldier GD Paper: [Aro. Jodhpur] - 2021

- 10
- 13
- 12
- 15

Option 4 : 15

**Concept :**

Number of persons × time duration = Total work

**Calculations :**

Total work = 15 × 20 units

Let the number of days taken by 20 men be d

According to the question

20 × d = 15 × 20

⇒ d = 15 days

**∴ Option 4 is the correct answer.**

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