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After only 20 cuts you would be left with a ballot .2900390625mm high by .205078125mm wide!! (That's 1/87 X 1/125 inches) Since this far less than the normal diameter of mechanical pencil led I doubt that anyone could vote with it because even a "dot" would not fit on the ballot.
Hmm. A4 paper is 21x29.7 cm, so it has an area of 623.7cm²
What a neat little exercise!
D. You are told that 250 sheets of paper make 1 inch, so to get the height, just divide the amount of ballots by 250 and that is the amount of inches.