13) 6 oxen or 8 cows can graze a field in 21 days. How long would 9 oxen and 2 cows take to graze che same field?
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Answer:
16 days
Step-by-step explanation:
6 oxen =8 cows
1 oxen = 8/6 cows
9 oxen = 8/6×9 cows =12 cows
(9 oxen+2 cows)=12 cows+2 cows=14 cows
Now, 8 cows can graze the field in 28 days
1 cow can graze the field in ( 28*8)days
14 cows can graze the field in =28*8/14=16 days
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