400
The library has a large collection of books. Mrs. Peterson ordered 2,200 more books. Now there are 13,327 books. This is how many books Mrs. Peterson started with. FOR FULL POINT VALUE, YOU MUST INCLUDE AN EQUATION AND AN ANSWER.
What is
b + 2,200 = 13,327
OR
b=13,327 - 2,200
b= 11,127 books