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

### Instruction:
 Charles alinunua karatasi 20 za kuchora. Leo Charles alichora picha 6. Jana alichora picha 6 kabla ya kwenda kazini na picha kadhaa aliporudi. Charles alichora picha ngapi aliporudi kazini akijua ana karatasi 2 zilizobaki?


### Response:
 Charles alichora picha 6 + 6 = <<6+6=12>>12.
Ana karatasi 20 – 12 = <<20-12=8>>8 zilizobaki.
Hivyo Charles alichora picha 6 aliporudi kazini.