yumnu
Answered

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The library sells 500 books at its annual used-book
fundraiser. They take in a total of $3940. Children's
books cost $5, and adult books cost $9. How many
children's books did they sell?
Let e = number of children's books sold, and Let
a= the number of adult books sold.
Which system of equations can the librarians use to
solve this problem?
A.
5c+9a=500
c+a=3940
c+a=500
C.
5c+9a=3940
B.
a=500-c
9c+5a=3940
a+c=500
D.
5a+9c=3940
​

Sagot :

mhanifa

Answer:

Children's books

  • Number  = c
  • Cost of each = $5
  • Total of children's books = 5c

Adult books

  • Number  = a
  • Cost of each = $9
  • Total of children's books = 9a

The equations reflecting the totals are

  • Books       ⇒  c + a = 500
  • Total cost ⇒  5c + 9a = 3940

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