300
On Monday, the bookstore sold 75 books. On Tuesday, the bookstore sold 125 books. The bookstore must sell 500 books by Friday. What equation can be used to find how many more books, b, the bookstore must sell.
A: 125+500+75=b
B: (125+75)-500=b
C: 500-(75+125)=b
D: b=75+(125-500
What is C