if 8 oxen or 6 horses eat the grass of a field in 10 days,in how many days will 4 oxen and 2 horses eat it ?

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8 oxen eat a grass of a field in 10 days.

so, 4oxens means half of the 8 oxens and the 4 oxens will take double time to eat a field of grass.

means 10*2=20

4 oxens will take 20 days to eat a field of grass.

if 6 horses eat a grass of field in 10 days

so, 2 horses means three times less than 6 horses so, 2 horses will take three times more time to eat a field of grass.

10*3=30

2 horses will take 30 days to eat a grass of field.