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this is writing not math but the answer would be -500+20= -480
I would give it 6 out of 10 as a title for story. Most likely it would be about zombies. -500 would be the zombies with 20 living humans left which is normal for zombie stories.
Really @Mandre? Most of the zombie stories I have encountered the ratio of dead dead zombies (since they are already dead, you must kill them again making them dead dead) to living humans is more like -100:2. So for 20 living humans you're looking at a minimum of -1000 dead dead zombies. Oh yeah. And @mohammedchowdhury that is a great title for a zombie story, unless you were asking a math question, in which case next time you might want to ask it in the Math group to avoid all the sarcasm.