Practice GMAT Data Sufficiency Question
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How many members of the staff of Advanced Computer Technology Consulting are women from outside the United States?
 onefourth of the staff at Advanced Computer Technology Consulting are men
 20% of the staff, or 20 individuals, are men from the U.S.; there are twice as many women from the U.S. as men from the U.S.
Correct Answer: C
 Note that this question asks for a specific number, not a ratio. Consequently, keep in mind that knowing y percent of the total staff is composed of women from outside the United States is not sufficient.

Evaluate Statement (1) alone.
 If 25% of the staff are men, 75% must be women.

Men Women Total From U.S. From Outside U.S. .25(x) .75(x) x  There is not enough information to determine the number of women from outside the United States. Statement (1) alone is NOT SUFFICIENT.

Evaluate Statement (2) alone.
 Since 20 men from the U.S. represent 20% of the staff, the total staff is 100. We also know that there are 20 men from the U.S. and 2(20)=40 women from the U.S. for a total of 20+40=60 employees from the U.S. Consequently, 10060=40 employees must be from outside the U.S.

Men Women Total From U.S. 20 40 60 From Outside U.S. 40 x=100  Since we cannot determine the breakdown of the 40 employees from outside the U.S., it is impossible to determine the number of women from outside the U.S.; Statement (2) alone is NOT SUFFICIENT.

Evaluate Statements (1) and (2) together.
 Fill in as much information as possible from Statements (1) and (2). We now know that there are a total .25(x)=.25(100)=25 men and .75(x)=.75(100)=75 women.

Men Women Total From U.S. 20 40 60 From Outside U.S. 5 35 40 25 75 x=100  35 members of the staff of Advanced Computer Technology Consulting are women from outside the United States.
 Since Statement (1) alone is NOT SUFFICIENT and Statement (2) alone is NOT SUFFICIENT, but Statements (1) and (2), when taken together, are SUFFICIENT, answer C is correct.
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