Firefighter Practice Exam 2026 - Free Firefighter Practice Questions and Study Guide

To find the total annual consumption of diesel fuel from an 850-liter underground tank that is filled six times a year, you first need to calculate the total volume filled over the year.

Each filling contributes 850 liters, and with six fill-ups throughout the year, the calculation would be:

850 liters/fill × 6 fills/year = 5,100 liters/year.

Next, to convert liters to kiloliters (since 1 kiloliter equals 1,000 liters), you divide the total liters by 1,000:

5,100 liters/year ÷ 1,000 = 5.1 kiloliters/year.

Thus, the annual consumption of diesel fuel is 5.1 kiloliters. The correct answer is based on accurately performing the calculations and understanding the units being converted. The other options represent values that are either orders of magnitude too high or too low, which highlights the importance of careful mathematical processing in such problems.