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In triangle XYZ, whatis the length of YZ? [#permalink]
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29 Jan 2014, 02:19
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The Official Guide For GMAT® Quantitative Review, 2ND EditionIn triangle XYZ, whatis the length of YZ? (1) The length of XY is 3. (2) The length of XZ is 5. Data Sufficiency Question: 65 Category: Geometry Triangles Page: 157 Difficulty: 600 GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition  Quantitative Questions ProjectEach week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution. We'll be glad if you participate in development of this project: 1. Please provide your solutions to the questions; 2. Please vote for the best solutions by pressing Kudos button; 3. Please vote for the questions themselves by pressing Kudos button; 4. Please share your views on difficulty level of the questions, so that we have most precise evaluation. Thank you!
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Re: In triangle XYZ, whatis the length of YZ? [#permalink]
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29 Jan 2014, 02:20



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Re: In triangle XYZ, whatis the length of YZ? [#permalink]
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29 Jan 2014, 03:02
Bunuel wrote: The Official Guide For GMAT® Quantitative Review, 2ND EditionIn triangle XYZ, whatis the length of YZ? (1) The length of XY is 3. (2) The length of XZ is 5. Thank you![/textarea] IMO: D taking only A, not sufficient because only one side is known taking only B , insufficient since only one side is known combining both together , sufficiant because it forms a triplet and the third side = 4



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Re: In triangle XYZ, whatis the length of YZ? [#permalink]
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29 Jan 2014, 03:12
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From S1:knowing length of one side is not sufficient to determine length of others in a triangle unless it is of a particular type. From S2:Sam explanation.Insuffficient. Combining the two we could have the third side as 3,4,5,6,7(sum of two sides in a triangle always greater than third) but no single length can be known. Ans.E



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Re: In triangle XYZ, whatis the length of YZ? [#permalink]
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29 Jan 2014, 23:31
Statement 1: From length XY = 3, we cannot determine the length of YZ; Not Sufficient. Statement 2: From lenth XZ = 5, we cannot determine the length of YZ; Not Sufficient.
Combining both statements, we still cannot definitely find a value for YZ as the length of YZ could be any integer from 3 to 7. Do not assume that YZ will be 4, as nowhere has it been stated that the triangle is a right angled triangle.
Ans is (E).



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Re: In triangle XYZ, whatis the length of YZ? [#permalink]
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29 Jan 2014, 23:58
Straight (E). Exactly as nutshell explained.



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Re: In triangle XYZ, whatis the length of YZ? [#permalink]
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Re: In triangle XYZ, whatis the length of YZ? [#permalink]
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08 Jan 2015, 16:03
I know this is basic but it doesn´t hurt to mention it once again... Watch out for Pythagorean triple impostors!We want the Gmat to be just a patternbased exam and whenever we look at keywords such as "triangle + 3 + 5", our brain wants to assume that the remaining side must equal 4. Fight that instinct (even if your behind time). Besides, nowhere in the passage is it mentioned that this is a right triangle!
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Re: In triangle XYZ, whatis the length of YZ?
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