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

### Instruction:
Lucille is wondering who has the tallest house between her and her neighbors. His family's house is 80 feet tall. One neighbor's house is 70 feet tall. Another neighbor's house is 99 feet tall. How much shorter is Lucille's house than the average height?

### Response:
 Nyumba hizo zina urefu wa jumla wa futi 249 kwa sababu 70 + 80 + 99 = <<70+80+99=249>>249
Urefu wa wastani ni futi 83 kwa sababu 249 / 3 = <<249/3=83>>83
Nyumba yake iko chini kwa futi 3 kwa sababu 83 - 80 = <<83-80=3>>3