ABSTRACT
Let’s try a little mind experiment. Suppose I tell you we are going to solve a problem that uses a case of soda (24 cans). What sort of mental picture do you get? Do you think about a huge cardboard carrying case full of cans or do you picture 24 individual cans of cola? Do you think about two twelve-packs? Four six-packs? Certainly, any of these is a reasonable alternative. You could be thinking of that case as 24 cans, 2 (12-packs), 4 (6-packs), or 1 (24-pack).
