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

### Instruction:
 Candice alisoma vitabu mara 3 zaidi ya Amanda katika Mashindano ya Vitabu ya shule yao. Kara alisoma nusu ya idadi ya vitabu alivyosoma Amanda, na Patricia alisoma vitabu mara 7 zaidi ya idadi ya vitabu alivyosoma Kara. Ikiwa Candice alisoma vitabu 18, Patricia alisoma vitabu vingapi?


### Response:
 Amanda alisoma vitabu 18/3=<<18/3=6>>6.
Kara alisoma vitabu 6/2=<<6/2=3>>3.
Patricia alisoma vitabu 7*3=<<7*3=21>>21.