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

### Instruction:
 Kalamu ni ndefu kuliko mswaki kwa sentimita 3, na fupi kuliko penseli kwa sentimita 2. Kwa kuzingatia penseli ina urefu wa sentimita 12, urefu jumla wa mswaki, kalamu, na penseli ni upi?


### Response:
 Kalamu ina urefu wa 12 - 2 = <<12-2=10>>10 sentimita.
Mswaki ni mfupi kuliko kalamu kwa sentimita 3, hivyo ina urefu wa 10 - 3 = <<10-3=7>>7 sentimita.
Urefu jumla ni 7 + 10 + 12 = <<7+10+12=29>>29 sentimita.