Data Sufficiency from A to Z
GMAT Question of the Day: Sentence Correction
May 20, 2022Critical Reasoning - Mayor of GMAT Prep
May 26, 2022Data Sufficiency from A to Z
Explanation
The question stem tells us that either x must be 0 or else y must equal z.
Statement (1) We cannot determine whether z = 2 or x = 0 AND z = 4, so this statement alone is insufficient.
The correct answer could be B, C, or E. Statement (2) Since , y must equal z. But without knowing the value of y, we do not know whether.
The correct answer must be either C or E. Statement (1 & 2) The statements together tell us , so they are sufficient together.
The correct choice is C.
Statement (1) We cannot determine whether z = 2 or x = 0 AND z = 4, so this statement alone is insufficient.
The correct answer could be B, C, or E. Statement (2) Since , y must equal z. But without knowing the value of y, we do not know whether.
The correct answer must be either C or E. Statement (1 & 2) The statements together tell us , so they are sufficient together.
The correct choice is C.
3 Comments
this is a messed up explanation, even the vocab is not good.
What if:
xy=xz then, xy-xz=0 x(y-z)=0 x=0; y-z=0; y=z
choice A says that y=2; then z is also 2, this should be sufficient to answer that z is not 4, but 2
Please clarify.
@Emil - for x=0, y not necessarily equals to z, hence without knowing about whether x is 0 or not we can not come to any conclusion.