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## Explanation

- If 36 men can do a piece of work in 25 hours.
- Time required by the 15 men can be figure out in this way.

Two given entities here are

- Men
- Time

- Time increases as the men decreases.
- Time decreases as the men increases.

This clearly indicates that there is inverse relation.

Direct/Indirect relation tells how the equation will be written.

36/15 = y/25

This equation gives the time required by the 15 men (60 hours).

## To Find

Time required by the 15 men = ?

## Solution

**Method I**

Let suppose time required by the 15 men = y

Men Time

36 25 hrs

15 y

As, there is inverse relation so;

36/15 = y/25

36 x 25 = 15 x y

900 = 15y

y = 900/15

y = 60

**Time required by the 15 men to get the job done = 60 hours answer**

**Method II**

36 men can do a piece of work = 25 hours

1 man can do a piece of work = 25 x 36 hours

1 man can do a piece of work = 900 hours

15 men can do a piece of work = 900/15 hours

15 men can do a piece of work = 60 hours

**Time required by the 15 men to get the job done = 60 hours answer**

## Conclusion

If 36 men can do a piece of work in 25 hours, 15 men will take 60 hours to get the job done.