Answers

2014-03-14T11:50:40+05:30
1 cow graze in 7/3days
so for 7days
3 cows will graze
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2014-03-14T12:34:29+05:30
1 cow will graze for 3/7 days 
for 7 days = 3/7×7/1 = 3 cows
that means 3 cows will complete grazing in 7 days

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