GMAT數學練習題一則

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數學
A factory has 500 workers, 15 percent of whom are women. If 50 additional workers are to be hired and
all of the present workers remain, how many of the additional workers must be women in order to raise
the percent of women employees to 20 percent?
(A) 3
(B) 10
(C) 25
(D) 30
(E) 35

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邏輯
Although custom prosthetic bone replacements produced through a new computer-aided design process will
cost more than twice as much as ordinary replacements, custom replacements should still be cost-effective.
Not only will surgeryand recovery time be reduced, but custom replacements should last longer, thereby
reducing the need for further hospital stays.
Which of the following must be studied in order to evaluate the argument presented above?
(A) The amount of time a patient spends in surgery versus the amount of time spent recovering from surgery
(B) The amount by which the cost of producing custom replacements has declined with the introduction of the
new technique for producing them
(C) The degree to which the use of custom replacements is likely to reduce the need for repeat surgery when
compared with the use of ordinary replacements
(D) The degree to which custom replacements produced with the new technique are more carefully
manufactured than are ordinary replacements
(E) The amount by which custom replacements produced with the new technique will drop in cost as the
production procedures become standardized and applicable on a larger scale

答案：E

邏輯
A Comparing time in surgerywith time in recovery does not lead to a conclusion about the two
kinds of replacements and their cost-effectiveness.
B The cost-effectiveness of the custom replacements isbeingprojected in the current moment; a
previousdecline in production costswould already havebeen taken into account.
C Correct. This statement properly identifies evidence of cost-effectiveness that would assist in
evaluating the argument.
D The analysis is about cost-effectiveness; it is not about the level of care taken in manufacture.
E Anticipating a future drop in production costs is outside the scope of the analysis, which should be
based on current conditions.
The correct answer is C.

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