Thankyou, sd, both for your call of atention and for your help with my language doubt. Part of this quest for eloquency has to do with the fact that all along the paper these two problems are named as "the 24 box problem" and "the 72 box problem". Also, this is a modeled mathematical scenario, so I cannot talk about actual "loaded containers"

Regarding your last sugestion, I think we're getting closer to the point, but "24 and 72 box problems" makes it a general statement about those types of problems. But the point here is about the specific 24 and 72 box problems dealt with in the paper. That is what the phrase "**a** 24 and a 72 box problems" wants to get across.

Besides, is it so "inflationary" to want to be as synthetic as possible? This is a doubt I've always had in English, and in many ocassions I've got around. Today, I would just like to clear how to deal with the plural s when you have two singular things with something in common.