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Data Sufficiency Timing and Trap Control
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GMAT
DI.124 Data Sufficiency Timing and Trap Control
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A Data Sufficiency item asks: What is the average of x, y, and z? (1) x + y + z = 45. (2) z = 15. Which conclusion is most efficient?
A
Statement (2) alone is sufficient; one value determines the three-number average.
B
The statements are sufficient only together; the value of z must be combined with the total.
C
Statement (1) alone is sufficient; the average is the total divided by 3.
D
Even together the statements are not sufficient; averages require each individual value.
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