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?
Китобхона 9,900 китоб дорад. Дар давраи тобистон, онҳо баъзе китобҳоро фурӯхтанд. Агар танҳо чор шашум аз китобҳо боқӣ монда бошад, онҳо чанд китоб фурӯхтанд?
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
What is one sixth of the books? ** Як шашуми китобҳо 9900/6 = <<9900/6=1650>>1650 китоб аст.  
How many books are left? ** Танҳо 4*1650 = <<4*1650=6600>>6600 китоб боқӣ мондааст.  
How many books did the library sell over the summer? ** Китобхона 9900-6600= <<9900-6600=3300>>3300 китобро дар тобистон фурӯхт.  
#### 3300