Solutions

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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

Medium

Solution

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