GMAT Quantitative Reasoning Practice Test 6

Question : 48 of 100

Marks: +1, -0

What is the average height of

X

buildings, each with height

P

meters, and

4 X

buildings each
with height

P{/} 2

?
(1)

X=5, P=35

.
(2)

P=40

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:

Of course, statement (1) gives of the values of all the parameters, but the value of

X

is unnecessary.

(X P+2 X P) / {5 X}

is equivalent to

3 P {/} 5

. Statement (2) also gives us the answer.

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