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

### Instruction:
Rodney is a door-to-door salesman trying to sell home security systems. He gets a commission of $25 for each system he sells. He is canvassing a neighborhood of four streets with eight houses each. The first street gave him half the sales that the second street did, while every house on the third street turned him away and the fourth street resulted in only one sale. His total commission was $175. How many security systems did he sell on the second street?

### Response:
 Hebu S iwe idadi ya mifumo Rodney aliyouza katika mtaa wa kwanza.
Aliuza mifumo 2S katika mtaa wa pili.
Kulingana na tume yake, aliouza mifumo 175 / 25 = <<175/25=7>>7.
Jumla ya mifumo aliyouza ni S + 2S + 0 + 1 = 3S + 1 = 7.
Hivyo, Rodney aliouza mifumo 3S = 7 - 1 = <<7-1=6>>6 katika mitaa ya kwanza na ya pili.
Hivyo, aliouza mifumo 2S = 6 / 3 = <<2=2>>2 katika mtaa wa kwanza.
Hivyo, Rodney aliouza mifumo 2 * 2 = <<2*2=4>>4 ya usalama katika mtaa wa pili.