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

### Instruction:
The tallest of 3 trees is 108 feet.  The middle sized tree is 6 feet less than half the height of the tallest tree. The smallest tree is 1/4 the height of the middle tree.  How tall is the smallest tree?

### Response:
 Mti mrefu zaidi: futi 108
Mti wa ukubwa wa kati: (108/2)-6
Mti mdogo: 1/4((108/2)-6) = futi 12