At elisa's printing company llc there are two kinds of printing press: model a which can print 70 books per day and model b which can print 55 books per day. the company owns 14 total printing presses and this allows them to print 905 books per day. how many of each type of press do they have?

Number of Model A press = 9 and Number of Model B press = 5

Step-by-step explanation:

Number of books Model A can print per day = 70

Number of books Model B can print per day = 55

Let x be the number of Model A press and y be that of Model B press.

Total number of printing presses = 14

x + y = 14  1

Total number of books printed per day = 905

70x + 55y = 9052

Putting y = 14 - x in equation 2, we get:

70x + 55(14 - x) = 905

15x = 135

x = 9

y = 14 - 9 = 5

Hence number of Model A press is 9 and that of Model B press is 5.

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed