6 oxen or 8 cows can graze a field in 28 days. How long would 9 oxen and 2 cows take to
graze the same field?
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let the area of the field to be grazed is F
given that 6 oxen can graze the field in 28 days
⇒ 6 oxen graze an area of F/28 in one day
⇒ 1 ox grazes an area of F/168 in one day
⇒ 9 oxen graze an area of 3F/56 in one day
given that 8 cows graze the field in 28 days
⇒ 8 cows graze an area of F/28 in one day
⇒ 1 cow grazes an area of F/224 in one day
⇒ 2 cows graze an area of F/112 in one day
9 oxen and 2 cows graze an area of (3F/56 + F/112) in one day
⇒ 9 oxen and 2 cows graze an area of F/16 in one day
⇒ 9 oxen and 2 cows graze an area of F in 16 days
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