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