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

### Instruction:
A water tower that serves four neighborhoods around it holds 1200 barrels of water and is filled to the top each week. If one neighborhood uses 150 barrels of water in a week, the second neighborhood uses twice as many barrels of water as the first neighborhood in a week, and the third neighborhood uses one hundred more barrels of water than the second neighborhood in a week, how many barrels are left for the fourth neighborhood?

### Response:
 Mtaa wa Kwanza = <<150=150>>150 mapipa
Mtaa wa Pili = 150(2) = <<150*2=300>>300 mapipa
Mtaa wa Tatu = 300 + 100 = <<300+100=400>>400 mapipa
1200 - 150 - 300 - 400 = <<1200-150-300-400=350>>350 mapipa