Question: 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

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 39.9 units of niacin and 18,860 units of retinol. She uses two types of commercial pellet foods. Food A contains 0.22 unit of niacin and 115 units of retinol per gram. Food B contains 0.30 unit of niacin and 70 units of retinol per gram. How many grams of each food does she feed this group of rats each day?

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