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 filling a punch bowl that can hold 16 gallons of punch. He fills it part way, then his cousin comes along and drinks half the punch in the bowl. Mark starts to refill the bowl and adds 4 more gallons, but then his friend Sally comes in and drinks 2 more gallons of punch. After that, Mark has to add 12 gallons of punch to completely fill the bowl. How much punch did Mark initially add to the bowl?

### Response:
 Mark aliongeza awali 16/2 = <<16/2=8>>8 galoni za kinywaji kwenye bakuli.
Binamu yake alinywa nusu ya hiyo, ambayo ni (16/2)/2 = <<(16/2)/2=4>>4 galoni, hivyo kubakiwa na 8 - 4 = 4 galoni kwenye bakuli.
Kisha Mark akaongeza galoni 4 zaidi, hivyo kubakiwa na galoni 8 kwenye bakuli.
Sally kisha alinywa galoni 2, hivyo kubakiwa na galoni 6 kwenye bakuli.
Hatimaye, Mark alilazimika kuongeza galoni 12 za kinywaji ili kujaza kabisa bakuli, hivyo Mark aliongeza awali galoni 8 za kinywaji kwenye bakuli.