-PJ
The problem is, your alegbraic equation does not account for mold because you could not use all that ketchup in time. It is a rediculas waste, algebra.
Defenders of algebra say it is necessary for day to day life and then someone comes along and tries to say you need algebra to decide if you should buy 1 jar or a dozen jars of ketchup.
If you are going to use an example to support your argument that algebra is necessary, can't anyone come up with a good example?
...you don't need that freaking much ketchup (and it comes in a bottle, not a jar!).