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ABC Bookstore sells packages of books that include both new and used books. New books cost $16 and used books cost $8. The bookstore wants to sell packages that have 30 books total, and the store charges $336 for each package. How many new and used books will be in each package?

A. 318 new, 12 used

B. 12 new, 18 used

C. 16 new, 8 used

D. 8 new, 16 used​

(It's B, just took the test)

Respuesta :

Answer:

b

Step-by-step explanation:

the following equations can be determined from the question

16n + 8o = 336 equation 1

n + o = 30 equation 2

where n = new books

o = old books

Multiply equation 2 by 8

8n + 8o = 240 equation 3

subtract equation 2 from 1

8n = 96

n = 12

substitute for n in equation 2

12 + o = 30

o = 18

Answer:

B. 12 new, 18 used

Step-by-step explanation:

Hope this helps!

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