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

### Instruction:
The vending machine fails to drop a snack when it’s purchased one in six times. One in ten times, it will accidentally drop two snacks. The rest of the time, it drops the purchased snack. If thirty people have used the vending machine once each to purchase a snack, how many snacks has the vending machine dropped?

### Response:
 Mashine ya kuuza imetumika mara 30, hivyo imeshindwa kutoa kitafunwa mara 30 / 6 = <<30/6=5>>5.
Mashine ya kuuza imetoa kitafunwa mbili mara 30 / 10 = <<30/10=3>>3.
Imefanya kazi kawaida na kutoa kitafunwa kimoja mara 30 - 5 - 3 = <<30-5-3=22>>22.
Hivyo, mashine ya kuuza imeitoa jumla ya kitafunwa 22 + 3 * 2 = 22 + 6 = <<22+3*2=28>>28 katika matumizi thelathini.