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

### Instruction:
Hayden has a tank with a small hole in the bottom. The tank starts with 40 gallons of water. It loses 2 gallons of water per hour. Hayden does not add any water for the first two hours. He adds 1 gallon of water to the tank in hour three. He adds three gallons of water to the tank in the fourth hour. How much water is left in the tank at the end of the fourth hour?

### Response:
 Katika saa nne, tangi linapoteza galoni 2 * 4 = <<2*4=8>>8 za maji.
Hayden anaongeza jumla ya galoni 1 + 3 = <<1+3=4>>4 za maji.
Kuna upotevu wa jumla ya galoni 8 - 4 = <<8-4=4>>4 za maji.
Hii inamaanisha kuna galoni 40 - 4 = <<40-4=36>>36 za maji zilizobaki kwenye tangi mwishoni mwa saa nne.