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

### Instruction:
 Ikiwa pembetatu ina upana wa inchi 42 na eneo la inchi 1638, pembetatu ngapi za ukubwa huo zingefikia urefu wa inchi 390?


### Response:
 Kwa kuwa pembetatu ina eneo linalobadilika, basi urefu wa pembetatu unategemea upana. Hivyo L= 1638 in/42in = <<1638/42=39>>39 inchi.
Ikiwa unahitaji kufunika urefu wa inchi 390, basi utahitaji pembetatu 390/39 = <<390/39=10>>10 za ukubwa huo.