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

### Instruction:
 Sarah, Mary, na Tuan waliamua kwenda kwenye mgahawa kwa chakula. Walikubaliana kugawana gharama ya chakula kwa usawa. Ikiwa bei ya jumla ya chakula ni $67 na wana kodi ya $4, kila mtu anahitaji kuchangia kiasi gani kwenye bili?


### Response:
 Jumla ya bili ni 67-4=<<67-4=63>>63 dola.
Ikiwa watatu wao wanagawana bili, basi kila mtu anapaswa kulipa 63/3=<<63/3=21>>21 dola.