by tim Tue Nov 15, 2011 11:52 pm
Briefly, "fewer than" is used when the items are countable (eg. hats, number of airplane flight delays), and "less than" is used when the items are not countable, which usually means they must be measured with a measuring device such as a beaker or clock (eg. water, cumulative time of flight delay)..
Tim Sanders
Manhattan GMAT Instructor
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