Question

If 20 men can reap a field in 9 days, then in how many days can 30 men reap the same field?​

Answer 1

Answer:

18 days

Step-by-step explanation:

because if 20 men can do 9 day

then 30 men can do 18 days

9+9=18

Answer 2

Step-by-step explanation:

Answer:

Time taken by 20 men = 22.5 days

Step-by-step explanation:

In the given question,

Time taken by 30 men to reap a field = 15 days

So,

We need to calculate the time taken by 20 men to reap the same field.

So,

Total number of men-days = 30 x 15 = 450 men-days

Now,

Let us say the time taken by 20 men = x days

So,

Total number of men days by them = 20 \times x20×x

So,

Total number of men-days by 20 men = Total number of men-days by 30 men

20x = 450

x = 22.5 days

This method is also called as inverse proportion method.

Hence, Time taken by 20 men = 22.5 days.

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