Ok then. So, when he says how many lemmings die, this is just indicative. This is just for his solution.
Something nice would be to test every level and specify how many lemmings can die to have a gold medal and also, specify if it's possible to save all of them.
You are correct, the number of lemmings that die are the ones that die in my solution. I never bothered finding out the maximum number of lemmings that may die. I just wanted a gold medal
.
PS I must state that however most solutions are though up by me, I had some help (using existing walkthroughs) on some levels.