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

### Instruction:
Nelly wants to buy pizza for herself and her 14 friends. Each pizza costs $12 and can feed 3 people. If Nelly earns $4 a night babysitting the neighbors' kids, how many nights will she have to babysit to afford the pizza?

### Response:
 Nelly anahitaji kununua pizza 15 / 3 = <<15/3=5>>5.
Pizza zinagharimu $12 x 5 = $<<12*5=60>>60 jumla.
Itamchukua $60 / $4 = <<60/4=15>>15 siku za kulea watoto ili aweze kumudu pizza.