Free GMAT Practice Question

Question 1 of 1
ID: GMAT-QR-PS-018
Section: GMAT Quantitative Reasoning - Problem Solving (PS)
Topic: Number Properties
Difficulty level: Hard

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If $x$ and $y$ are real numbers such that $4x^2+25y^2=20xy$, which of the following statements must be true?

I. $2x=5y$

II. $2x=-5y$

III. $xy\ge 0$

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