what is the answer?

Dear Student

Given,
5 farmers can reap the field in 4 hours.
So, 1 farmer will be able to reap the field in 5 × 4 = 20 hours

In 20 hours, 1 farmer can reap the field. 
In 1 hour, 20 × 1 = 20 farmers can reap the field. 

Regards

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Try yourself.
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if area = x
then 
x/5 = 4
x=20
area of land = 20
20/?=1
?=1*20
  =20
 
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