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

### Instruction:
There is a 5,200 sq. ft. house and a 7,300 sq. ft. house next to each other. The smaller house is being expanded. If the new total square footage of both houses is 16,000 sq. ft., how much is the smaller house being expanded by, in sq. ft.?

### Response:
 Kwa awali, nyumba hizo zina jumla ya futi za mraba 5200 + 7300 = <<5200+7300=12500>>12500.
Nyumba ndogo itapanuliwa kwa futi za mraba 16000 - 12500 = <<16000-12500=3500>>3500.