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

### Instruction:
John and Sam were hungry so they ordered an extra-large pizza that was pre-sliced into 12 pieces.  John ate 3 slices while Sam ate twice the amount that John ate.  How many slices of pizza were left?

### Response:
 Sam alikuwa na mara mbili ya John hivyo Sam alikula vipande 3*2 = <<3*2=6>>6
Pamoja, walikula vipande 3+6 = <<3+6=9>>9
Pizza 1 ina vipande 12. Vipande 9 vilikula hivyo 12-9= <<12-9=3>>3 vipande vilisalia