<human>:  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?
<bot>: 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