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Q.

A farmer has enough food to feed 20 animals in his cattle for 6 days. How long would the food last if there were 10 more animals in his cattle ?


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a

5 days

b

6 days

c

4 days

d

8 days

answer is C.

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Detailed Solution

Concept- To determine the number of days to feed 30 animals, first determine the total feed for 20 animals, then simply equalize the total feed to the feed required for 30 animals.
If the farmer has  food  that  can feed 20 animals in up to 6 days.
Therefore, the total amount of food is Question ImageRaising an additional 10 animals means that 30 animals are sufficient in x days. So, the total food of 30 animals is equal to Question ImageThe total amount of feed for 20  and 30 animals has been found to be the same. Therefore, both  equations (i) and (ii) are simply equalized. We get,
Question ImageHence, the correct answer is (3)
 
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