A researcher performs an experiment to test a hypothesis that involves the nutrients niacin and retinol. She feeds one group of laboratory rats a daily diet of precisely 34.37 units of niacin and 30,125 units of retinol. She uses two types of commercial pellet foods. food a contains 0.16 unit of niacin and 185 units of retinol per gram. Food b contains 0.33 unit of niacin and 50 units of retinol per gram. How many grams of each food does she feed this group of rats each day?