Problem-Solving & Data Analysis — module quiz

A data centre's backup generator burns diesel at a constant 8.4 liters per hour for every 100 kilowatts of load it is carrying. The generator is to run continuously at a load of 250 kilowatts for 3 days. Diesel is delivered only in sealed barrels holding 160 liters each. What is the smallest number of barrels that will hold enough diesel for the whole 3 days?