Four extra-large sandwiches of exactly the same size were ordered for m
students, where m > 4. Three of the sandwiches were evenly divided among the
students. Since 4 students did not want any of the fourth sandwich, it was
evenly divided among the remaining students. If Carol ate one piece from
each of the four sandwiches, the amount of sandwich that she ate would be
what fraction of a whole extra-large sandwich?
[解]前三塊分給m位學生，第四塊分給(m-4)位學生，Carol四塊都有被分到。
故比例為：(3/m)+[1/(m-4)]= [3(m-4)+m]/[m(m-4)]=(4m-12)/[m(m-4)]。
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