Since the FQIS was not working, Captain Pearson decided to take on enough fuel to reach Edmonton without refueling at Ottawa. The flight plan showed that of fuel was required for the flight from Montreal to Ottawa to Edmonton. A dripstick check found that there were of fuel already in the tanks. To calculate how much fuel the airplane had to take on, he needed to convert the volume (litres) to mass (kilograms), subtract that figure from 22,300 kg, and convert the result back into volume. The density in metric units was 0.803 kg/L, so the correct calculation would have been: