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OG 13th Data Suffiency question no.104

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by GMATGuruNY » Mon Nov 17, 2014 9:04 am
Please post the problem itself, not just the question number.
Here is DS104 in the OG13:
If [x] denotes the greatest integer less than or equal to x , is [x] =0?
(1) 5x + 1 = 3 + 2x
(2) 0 < x < 1
{x} = 0 implies that the GREATEST INTEGER LESS THAN OR EQUAL TO X is 0.

If 0≤x≤1, then the greatest integer less than or equal to x is 0.
Consider the following cases:
x=0 -------> The greatest integer less than or equal to 0 is 0.
x=0.0001 --> The greatest integer less than or equal to 0.0001 is 0.
x=0.9999 --> The greatest integer less than or equal to 0.9999 is 0.

If x<0 or x≥1, then the greatest integer less than or equal to x will NOT be 0.

Question stem, rephrased:
Is 0≤x≤1?

Statement 1: 5x + 1 = 3 + 2x
Since we can solve for x, we can determine whether 0≤x<1.
SUFFICIENT.

Statement 2: 0 < x < 1
SUFFICIENT.

The correct answer is D.
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by pchnts » Mon Nov 17, 2014 9:27 am
sorry, the next time I ll write also the question itself.
and thank you very much for your answer.
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by [email protected] » Mon Nov 17, 2014 10:23 am
Hi pchnts,

Mitch has properly explained this OG question, so I won't rehash that here.

This prompt is an example of a "symbolism" question; in these types of questions, a "made up" math symbol will be given to you, along with a description of what the math symbol means (usually involving some type of calculation). With this information, you will then be asked to perform some task using the symbol. You can expect to see 1 or 2 symbolism questions on Test Day and they are usually based on relatively low-level arithmetic or algebra.

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