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 32 units of niacin
and 22000 units of retinol. She uses two types of commercial pellet foods. Food A contains
0,12 unit of niacin and 100 units of retinol per gram. Food B contains 0,20 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?