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

### Instruction:
A trolley driver picked up 10 people on his 1st stop.  On the next stop, 3 people got off and twice as many people from the 1st stop got on.  On the third stop, 18 people got off and 2 got on.  How many people are currently on the trolley?

### Response:
 Kati ya dereva wa trela na wateja wake wa kwanza 10, kuna jumla ya watu 1+10 = <<1+10=11>>11 kwenye trela kwa sasa.
Kwenye kituo chake cha kwanza, watu 10 waliingia na mara mbili ya idadi ya watu waliingia kwenye kituo cha pili, hivyo watu 10*2 = <<10*2=20>>20 waliingia kwenye kituo cha pili.
Jumla ya watu kwenye trela baada ya kituo cha pili ni 11 (ambao walikuwepo) + 20 (ambao waliingia) - 3 (ambao waliingia) = <<11+20-3=28>>28 watu.
Kwenye kituo chake cha tatu, watu 18 waliingia na 2 waliingia, hivyo 28 watu - 18 watu + 2 watu = <<28-18+2=12>>12 watu.