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

### Instruction:
A roadwork company is paving a newly constructed 16-mile road. They use a mixture of pitch and gravel to make the asphalt to pave the road. Each truckloads of asphalt uses two bags of gravel and five times as many bags of gravel as it does barrels of pitch to make. It takes three truckloads of asphalt to pave each mile of road. The company paved 4 miles of road on one day, then one mile less than double that on the second day. How many barrels of pitch will the company need to finish the remaining road on the third day?

### Response:
 Siku ya pili, kampuni ilipiga lami maili 4 * 2 - 1 = <<4*2-1=7>>7.
Siku ya tatu, watahitaji kupiga lami maili 16 - 7 - 4 = <<16-7-4=5>>5 za barabara.
Kwa hiyo, watahitaji malori 3 * 5 = <<3*5=15>>15 ya lami kwa ajili ya kupiga lami maili 5 za barabara.
Kwa malori 15, watahitaji mifuko 15 * 2 = <<15*2=30>>30 ya kokoto.
Kwa hiyo, watahitaji 30 / 5 = <<30/5=6>>6 pipi za lami kumaliza barabara siku ya tatu.