Free GMAT Practice Question

Question 1 of 1
ID: GMAT-PS-022
Section: Quantitative Reasoning - Problem Solving (PS)
Topic: Average
Difficulty level: Medium

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If $p, q, r,\ \&\ s$ are distinct numbers such that $p+r=2s$ and $q+s=2r$, which of the following statements must be true?

I. $p$ cannot be the average (arithmetic mean) of $p, q, r,\ \&\ s.$

II. $q$ cannot be the average (arithmetic mean) of $p, q, r,\ \&\ s.$

III. $s$ cannot be the average (arithmetic mean) of $p, q, r,\ \&\ s.$

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