A fruit company uses two types of<br />fertilizers in an orange groove, brand A<br />and brand B. each bag of brand A<br />contains 8 pounds of nitrogen and 4<br />pounds of phosphoric acid. Each bag of<br />brand B contains 7 pounds of nitrogen<br />and 6 pounds of phosphoric acid. Test<br />indicates that the groove needs 720<br />pounds of nitrogen and 500 pounds of<br />phosphoric acid. How many bags of each<br />brand should be used to provide the<br />required amount of nitrogen and<br />phosphoric acid?<br />-<br />-<br />ELE<br />---<br />EL<br />ELLE<br />1<br />ILLEN<br />-​