if 40 cows are turned into a certain field, they will find just enought pasture for 20 days: if 30, for 30 days. how long will it last 25 cows, assuming that the grass grows at a uniform rate ?
if 40 cows are turned into a certain field, they will find just enought pasture for 20 days: if 30, for 30 days.how long will it last 25 cows, assuming that the grass grows at a uniform rate ?