Mr. Fortchaud turns on his heater on the 1st of November, 2005. The fuel tank was then full and contained 3,000 L. On January 1, 2006, the tank counter indicated that 180 L remained. Mr. Fortchaud again filled his tank completely. On 1 May 2006, Mr. Fortchaud decided to stop heating and he read 1,238 L on the meter. What the volume of fuel oil that was used between 1 November 2005 and 1 May 2006? Think carefully first, then make a decision:
I calculate consumption between November 1, 2005 and January 1, 2006: 3,000 180 = 2820 L. I calculate consumption between January 1, 2006 and May 1, 2006: 3,000 1238 = 1762 L. I calculate the total consumption between November 1st and May 1st: 2,820 + 1,762 = 4582 L. So, the answer is 4582.