Mathematics, 19.08.2019 12:30, scottmichetti

The library sells 376 books at its annual used-book fundraiser. they take in a total of $2120. childrens books cost $4, and adults books cost $7. how many childrens books did they sell?
let c = number of childrens books sold, and let a = the number of adult books sold.
which system of equations can the librarians use to solve this problem?
a. 4c+7a = 376
c+a = 2120
a= 376-c
b. 7c+4a = 2120
a+c = 376
c. 4a+7c=2120
c+a = 376
d. 4c + 7a = 2120

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