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

### Instruction:
 Zack amesafiri mara mbili ya idadi ya nchi ambazo Patrick alisafiri. Patrick alisafiri mara tatu ya idadi ya nchi ambazo Joseph alisafiri. Joseph alisafiri nusu ya idadi ya nchi ambazo George alisafiri. Ikiwa George alisafiri nchi 6, Zack alisafiri nchi ngapi?


### Response:
 Joseph alisafiri nchi 6 / 2 = <<6/2=3>>3.
Patrick alisafiri nchi 3 * 3 = <<3*3=9>>9.
Hivyo, Zack alisafiri nchi 2 * 9 = <<2*9=18>>18.