SOLUTION: If 15 oxen or 20 cows can eat the grass of a field in 80 days, then in how many days will 6 oxen and 2 cows eat the same grass?

Question 936926: If 15 oxen or 20 cows can eat the grass of a field in 80 days, then in how many days will 6 oxen and 2 cows eat the same grass?

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
oxen eat ( 1 field ) / ( 80 days )
ox eats ( 1 field ) / ( 15*80 days )
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cows eat ( 1 field ) / ( 80 days )
cow eats ( 1 field ) / ( 20*80 days )
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Add their rates of eating to get their rate eating together
Let their rate eating together = ( 1 field ) / ( d days )
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Multiply both sides by

6 oxen and 2 cows eat 1 field of grass in 160 days
check:

Multiply both sides by

OK

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