If 15 men can level a ground in 60 days, in how many days can 36 men level the same ground?

1. 24 days
2. 25 days
3. 27 days
4. 30 days

Given:

Days taken by 15 men = 60 days

Days taken by 1 man = 60 x 15 days $\quad$[Less men, More days]

Days taken by 36 men = $\Big(\dfrac{60 \times 15}{36}\Big) \text{ days} \quad \text{[More men, Less days]}$

= $\Big(\dfrac{5 \times 15}{3}\Big) \text{ days} \quad \text{[Dividing 60 and 36 by 12]}$

= 5 x 5 days $\quad$ [Dividing 15 and 3 by 3]

= 25 days

Hence, option 2 is the correct option.