Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
 Maktaba ina vitabu 9,900. Wakati wa kiangazi, waliuza baadhi ya vitabu. Ikiwa vitabu vinne kati ya sita vimebaki, waliviuza vingapi?


### Response:
 Maktaba ilikuwa na vitabu 9,900.
Sehemu ya vitabu vilivyobaki ni 4/6.
Sehemu ya vitabu vilivyouzwa ni 2/6.
Idadi ya vitabu vilivyouzwa ni 9,900 * (2/6) = <<9900*(2/6)=3300>>3,300.