Point 2:
  "If another student boils water already, he should add 200 ml of water in the teakettle"

Point 3:
  "If another student boils water and the teakettle is full already ..."

   And what is in the case if several students boil water already? I think I should read not "another student boils" but "the other students boil". Am I right?

Edited by author 23.03.2005 21:48

The 3rd point of instruction was corrected. Thank you.
But why wasn't the 2nd corrected too?
  By the way,"another students boil" is a grammar mistake. "The other students boil" is correct.
  I have AC after rejudge, but the problem statement was unclear to me when I've read it for the first time.