...But you can dump food...?

That's what got me on this one (Crying Emoji)

[Cries in poor]

That's amazing. You guys are out here doing the Lord's work.

This question F-ed my mind up for a good tens of minutes. It might help to focus on the conclusion and work your way backwards:

M has x2 as many cans as L (So if L has 10 cans, M has 20 cans)

Why?

Because all of the cans in L are recycled into M (50%) + M also has a new batch of aluminum that makes up the other 50% of its cans

Assuming no cans from L were lost in the recycling process, this argument is pretty valid.

Yo, I was just stuck trying to figure out where the dripping water was coming from, lol. I drew a map and everything. Turns out, that had nothing to do with any of the answer choices.

Moral of the story: don't focus on the details of a question so much that you burn through your time.