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

### Instruction:
Mark is looking to buy a total of 12 pieces of fruit at the store. He has already chosen 3 apples. He has also selected a bunch of bananas containing 4 bananas. How many oranges does he need to pick out to have 12 total pieces of fruit?

### Response:
 Ili kujua ni matunda mangapi zaidi Mark anahitaji kununua, kwanza tunapaswa kujua ni matunda mangapi tayari amechagua. Tunafanya 3+4=<<3+4=7>>7 matunda Mark amechagua tayari.
Kwa kuwa Mark anahitaji kununua matunda 12 na tayari amechagua 7, bado anahitaji machungwa 12-7=<<12-7=5>>5.