The library has 9,900 books. Over the summer, they sold some books. If only four sixths of the books are left, how many did they sell?
What is one sixth of the books? ** A sixth of the books is 9900/6 = <<9900/6=1650>>1650 books.
How many books are left? ** Only 4*1650 = <<4*1650=6600>>6600 books are left.
How many books did the library sell over the summer? ** The library sold 9900-6600= <<9900-6600=3300>>3300 books over the summer.
#### 3300