GMAT Quantitative Reasoning Practice Test 7

Question : 10 of 100

Marks: +1, -0

X

and

Y

are both integers different from zero, what is the value of

(X+2 Y)

?
(1)

X^4=Y^4

.
(2)

X=5

Statement (1) BY ITSELF is sufficient to answer the question, but statement (2) by itself is not.
Statement (2) BY ITSELF is sufficient to answer the question, but statement (1) by itself is not.
Statements (1) and (2) TAKEN TOGETHER are sufficient to answer the question, even though NEITHER statement BY ITSELF is sufficient.
Either statement BY ITSELF is sufficient to answer the question.
Statements (1) and (2) TAKEN TOGETHER are NOT sufficient to answer the question, requiring more data pertaining to the problem.

Solution:

Don't rush the answer, pay attention to the question carefully.
Statement (1) tells us that

X

and

Y

are equal? No, they could have different signs. Statement (2) gives us

X

, which is not sufficient.
Both statements together are also insufficient since

Y

can be -5 or 5 . More sufficient data is required.

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