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

### Instruction:
 Stanley aliuza vikombe 4 vya limau kwa saa. Ndugu yake, Carl, aliuza vikombe 7 vya limau kwa saa. Carl aliouza vikombe vingapi zaidi kuliko Stanley kwa masaa 3?


### Response:
 Stanley aliuza vikombe 4 x 3 = <<4*3=12>>12
Carl aliuza vikombe 7 x 3 = <<7*3=21>>21
Carl aliouza vikombe 21 - 12 = <<21-12=9>>9 zaidi ya Stanley.