a farmer has enough grains to feed 60 cattle for 10 days. he buy 10 more ccattle. for how many days will the grains last now ?
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If the number of animals increases food will last lesser number of days.
Thus two quantities vary inversely
Animals to feed =>60 ----> 70
Number of days food last =>6----> x
x=7
Hence the grains would last 7 days if the number of cattle is increased to 70.
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Thus the food will last for 4 days
Answer : 4 days
Answered by
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We will analyze the question as follows.
60 cattle for 10 days
now :
We have 10 more cattle :
60 + 10 = 70 cattle.
How many days will it take the 70 cattle.
60 : 10 days
70 : ?
60/70 × 10 = 8 4/7 days
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