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

### Instruction:
Carson is refilling his tires. Each tire can hold 500 cubic inches of air. Two of the tires are completely flat and empty. One tire is 40% full and the last tire is 70% full. If Carson injects 50 cubic inches of air with each pump, how many pumps will it take him to fill all the tires?

### Response:
 Kwanza, tafuta kiasi jumla cha hewa ambacho kinahitaji kuongezwa kwenye matairi: (inchi za ujazo 500 - inchi za ujazo 500) + (inchi za ujazo 500 - inchi za ujazo 200) + (inchi za ujazo 500 - inchi za ujazo 350) = <<500-500+500-200+500-350=750>>750 za ujazo.
Kisha, gawanya kiasi jumla cha hewa na kiasi kinachoongezwa kwa kila pampu ili kupata idadi ya pampu zinazohitajika: 750 za ujazo / 50 za ujazo/pampu = <<750/50=15>>15 pampu.