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marin [14]
3 years ago
15

Someone please help me with number 20

Mathematics
1 answer:
ankoles [38]3 years ago
6 0
(1) let there be x book and let the total cost be y dollars.
         y=19.25x+40
         y=16x+69.25
(2)  19.25x+40=16x+69.25
               3.25x=29.25
                      x=9
9 silver book, 9 gold book.
(3) y=19.25x+40=19.25*9+40=213.25 dollars
both companies' total cost are 213.25 dollars.
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