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  • Ties should go to Lavanya, since it was her birthday after all :) Commented Oct 31, 2012 at 17:50
  • would this work for 300, 5, 4, 3, 2, 1? I ask because the way you describe ("one pair at a time") it sounds like this will end with both kids owning 3 books each, while solution should be 300 and 15, 4, 3, 2, 1 Commented Oct 31, 2012 at 18:10
  • Read the problem again, @gnat. One book from each of the pairs must go to each of the kids. Commented Oct 31, 2012 at 18:36