Question

12 cows can graze a field for 10 days . In how many days will 20 cows graze the same field

Answer 1

12 cows --------> 10days
therefore 1cow---->10/12 days
Now 20 cows will graze in 20 x (10/12) = 50/3days

Answer 2

Question :

12 cows can graze a field for 10 days . In how many days will 20 cows graze the same field ?

Answer :

20 cows will graze the same field in 6days.

Given :

No.of days 12 cows take to graze the field = 10

To find :

No.of days 20 cows will take to graze the field

Solution :

Since greater number of cows will take lesser number of days , hence it is an inverse variation.

Let , x1 = 12 , x2 = 20 , y1 = 10

then y2 = ?

According to inverse variation ,

x1/x2 = y2/y1

=> 12 / 20 = y2 / 10

=> 12 × 10 = 20 × y2

=> 120 = 20y2

=> y2 = 120/20

y2 = 6

Hence, 20 cows will graze the same field in 6days.

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