Question

If 30 men can reap a field on 15 days then how many days can 20 men reap the same field. Solve using unitary method

Answer 1

the correct method is unitary method

Answer 2

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 = $20 \times x$

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.