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

### Instruction:
 Duka dogo limeunda mabango 50 kwa ajili ya kutangaza bidhaa zao. Mbili-kwa-tano ya mabango hayo ni mabango madogo wakati nusu yao ni mabango ya kati. Mengine ni mabango makubwa. Kuna mabango mangapi makubwa?


### Response:
 Mabango 50 ni 50 x 2/5 = <<50*2/5=20>>20 madogo.
Na mabango 50 ni 50/2 = <<50/2=25>>25 ya kati.
Hivyo 20 + 25 = <<20+25=45>>45 mabango siyo makubwa.
Hivyo, mabango 50 - 45 = <<50-45=5>>5 ni mabango makubwa.