Solutions
Get detailed explanations to advanced GMAT questions.
Question
If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?
I. One of the machines produces copies at a constant rate of 250 copies per minute.
II. One of the machines produces copies at twice the constant rate of the other machine
Option A:
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked.
Option B:
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked.
Option C:
BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.
Option D:
EACH statement ALONE is sufficient to answer the question asked.
Option E:
Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.
Difficulty Level
MediumSolution
Option E is the correct answer.
Option Analysis
Let’s say two machines A and B,
Statement I is insufficient: A = 250/minute no relation between A and B => Insufficient.
Statement II is insufficient: A=2B or B=2A => Insufficient.
Together I and II,
We don’t know A=250 or B=250 NS
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