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

### Instruction:
 Lizzie ana nusu ya idadi ya penseli kama Bobbie. Bobbie ana mara tatu ya idadi ya penseli kama Billie. Ikiwa Billie ana penseli 18, Lizzie ana penseli ngapi?


### Response:
 Bobbie ana penseli 18 * 3 = <<18*3=54>>54.
Lizzie ana penseli 54 * 1/2 = <<54*1/2=27>>27.