GMAT Number Properties DS 600 level practice question. Positive & Negative Numbers - Videos

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An easy but a very interesting GMAT number properties data sufficiency question. A 600 level question.

Concept: Elementary properties of positive and negative numbers.

Question
How many of the numbers x, y, and z are positive if each of these numbers is less than 10?
Statement 1: x + y + z = 20
Statement 2: x + y = 14

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