"Homework" or "The Secret File of the Catastrophic Calculation"

All dogs are supposed to take pictures of their owners homework to send in for examination in case of any harmful formulas or equations. Von Rabie missed sending his little Shiela's homework because she got in trouble for lying. After being contacted, Von Rabie sends in the homework pictures. But then it is discovered that Shiela made a formula that would help restaurants serve the correct amount of food to each individual person.