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This problem trains for: SAT-I.
A cow eats p lbs. of feed a day, a donkey eats 5 times less than a cow and a horse eats 6 lbs. more than the donkey. In terms of p how many pounds of feed does the horse eat per day?
Denote the amount of food for the donkey by D. A donkey eats:
A horse eats 6 lbs. more than the donkey, so add 6 to the donkey's ration:
After some algebraic manipulation we get one of the answer choices: