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

### Instruction:
A truck driver’s heavy semi truck can go 3 miles per gallon of gas. The truck driver needs to put gas in his truck at one gas station, but wants to put the minimum amount he needs to get him to a much cheaper gas station 90 miles away. He already has 12 gallons of gas in his tank. How many more gallons does the truck driver need to put in his semi to make it to the cheaper gas station?

### Response:
 Dereva wa lori anaweza kwenda 3 * 12 = <<3*12=36>>36 maili kwa mafuta kwenye tangi lake.
Anahitaji kwenda maili 90 - 36 = <<90-36=54>>54 zaidi.
Hivyo, dereva wa lori anahitaji kuweka galoni 54 / 3 = <<54/3=18>>18 zaidi ya mafuta kwenye lori lake.