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In the figure above, segments RS and TU represent two positions of the
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14 Feb 2014, 00:56
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The Official Guide For GMAT® Quantitative Review, 2ND EditionIn the figure above, segments RS and TU represent two positions of the same ladder leaning against the side SV of a wall. The length of TV is how much greater than the length of RV? (1) The length of TU is 10 meters. (2) The length of RV is 5 meters. Data Sufficiency Question: 91 Category: Geometry Triangles Page: 159 Difficulty: 650 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! Attachment:
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Re: In the figure above, segments RS and TU represent two positions of the
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14 Feb 2014, 00:57
MUST KNOW FOR THE GMAT: • A right triangle where the angles are 30°, 60°, and 90°.This is one of the 'standard' triangles you should be able recognize on sight. A fact you should commit to memory is: The sides are always in the ratio \(1 : \sqrt{3}: 2\). Notice that the smallest side (1) is opposite the smallest angle (30°), and the longest side (2) is opposite the largest angle (90°). • A right triangle where the angles are 45°, 45°, and 90°. This is one of the 'standard' triangles you should be able recognize on sight. A fact you should also commit to memory is: The sides are always in the ratio \(1 : 1 : \sqrt{2}\). With the \(\sqrt{2}\) being the hypotenuse (longest side). This can be derived from Pythagoras' Theorem. Because the base angles are the same (both 45°) the two legs are equal and so the triangle is also isosceles. BACK TO THE ORIGINAL QUESTION: In the figure above, segments RS and TU represent two positions of the same ladder leaning against the side SV of a wall. The length of TV is how much greater than Length of RV?Given: RS=TU. Question: TVRV=? Now, according to the properties above if we knew RS (or which is the same TU), then we would be able to find ANY line segment in the given figure: RS would give us RV and SV, while TU would give us TV and UV. Thus knowing RS/TU would be sufficient to get the value of TVRV. If we knew RV: we could get RS (or which is the same TU) and would have the same exact case as above. (1) The length of TU is 10 meters. Sufficient. (2) The length of RV is 5 meters. Sufficient. Answer: D. Similar questions to practice: aladder25feetlongisleaningagainstawallthatis130364.htmlinthefigureabovesegmentsrsandturepresenttwo140752.html
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Re: In the figure above, segments RS and TU represent two positions of the
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14 Feb 2014, 02:03
St1: The length of TU is 10 meters. Sufficient.
Triangle TUV is a 454590 triangle. The sides are in the ratio of 1:1:root 2. We can calculate the length of TV. Since the stem mentions TU and RS are the same ladder, RS = 10. Now, triangle RSV is a 306090 triangle. The sides are in the ratio of 1:root 3:2. We can calculate the length of RV.
St2: The length of RV is 5 meters. Sufficient. Applying same concept as statement 1, we can find TV.
Answer (D).



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16 Feb 2014, 02:19
Option D.Each is sufficient. Using basic trigo: From S1: TU=RS=10 mts. cos 45=TV/TU (cos 45=1/sqrt2 and TU=10) We can find TV And cos 60=RV/RS (cos 60=1/2 and RS=10 We can find RV The diff can be found out.Sufficient.
From S2: RV=5 We can find RS and TU by the same trigo formulacos (angle)=Base/Hypotenuse Then the diff between TV and RV can be found out.Sufficient.



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Re: In the figure above, segments RS and TU represent two positions of the
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17 Feb 2014, 02:01
MUST KNOW FOR THE GMAT: • A right triangle where the angles are 30°, 60°, and 90°.This is one of the 'standard' triangles you should be able recognize on sight. A fact you should commit to memory is: The sides are always in the ratio \(1 : \sqrt{3}: 2\). Notice that the smallest side (1) is opposite the smallest angle (30°), and the longest side (2) is opposite the largest angle (90°). • A right triangle where the angles are 45°, 45°, and 90°. This is one of the 'standard' triangles you should be able recognize on sight. A fact you should also commit to memory is: The sides are always in the ratio \(1 : 1 : \sqrt{2}\). With the \(\sqrt{2}\) being the hypotenuse (longest side). This can be derived from Pythagoras' Theorem. Because the base angles are the same (both 45°) the two legs are equal and so the triangle is also isosceles. BACK TO THE ORIGINAL QUESTION: In the figure above, segments RS and TU represent two positions of the same ladder leaning against the side SV of a wall. The length of TV is how much greater than Length of RV?Given: RS=TU. Question: TVRV=? Now, according to the properties above if we knew RS (or which is the same TU), then we would be able to find ANY line segment in the given figure: RS would give us RV and SV, while TU would give us TV and UV. Thus knowing RS/TU would be sufficient to get the value of TVRV. If we knew RV: we could get RS (or which is the same TU) and would have the same exact case as above. (1) The length of TU is 10 meters. Sufficient. (2) The length of RV is 5 meters. Sufficient. Answer: D. Similar questions to practice: aladder25feetlongisleaningagainstawallthatis130364.htmlinthefigureabovesegmentsrsandturepresenttwo140752.html
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New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread  All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
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Re: In the figure above, segments RS and TU represent two positions of the
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21 Feb 2015, 17:12
HI All, This is a great "pattern matching" question, in that if you recognize what you're looking at, you won't need to do ANY math to get to the correct answer. It doesn't take much to recognize the 30/60/90 and 45/45/90 right triangles in the drawing. The "key" to the shortcut is that we're told that that RS and TU are the SAME length  in math terms, this means that the hypotenuse of those two triangles is the SAME. By extension, if you know the length of ANY of the sides in EITHER of the triangles, then you can figure out EVERY side length in that drawing. If you recognize this pattern, then dealing with the two Facts won't take much time or effort at all. As an aside on the prior post in this thread, the GMAT will NEVER ask you a question that requires Trigonometry to solve it, so you do NOT need to know any Trig rules for this test. GMAT assassins aren't born, they're made, Rich
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Re: In the figure above, segments RS and TU represent two positions of the
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12 Jul 2015, 01:38
The most important point is here the word "THE SAME LADDER !!!"  missed it at the begining, but then could easily solve.. all other things in this question are just using known formulas for two particular triangles.
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Re: In the figure above, segments RS and TU represent two positions of the
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08 Dec 2015, 17:52
I did a crucial mistake, and forgot to take into consideration that TS = RU. Clearly, D is the correct answer. with each statement, we can find the lengths of the legs/hypotenuse, and thus find the TR...



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Re: In the figure above, segments RS and TU represent two positions of the
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02 May 2016, 23:46
Bunuel wrote: The Official Guide For GMAT® Quantitative Review, 2ND EditionAttachment: Untitled.png In the figure above, segments RS and TU represent two positions of the same ladder leaning against the side SV of a wall. The length of TV is how much greater than the length of RV? (1) The length of TU is 10 meters. (2) The length of RV is 5 meters. Data Sufficiency Question: 91 Category: Geometry Triangles Page: 159 Difficulty: 650 This question is one of the finest example of C trap. But remember for a 306090(1:\sqrt{3}:2) and 454590(1:1:\sqrt{2}) right angle triangle, knowing any side is sufficient to find other side. And length of ladder will be same no matter what position or what angle we put it. Essentially we have 2 right triangles with equal hypotenuse. Statement 1&2 both give us mease of one side so we can find the measure of all the sides. Answer is D.



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Re: In the figure above, segments RS and TU represent two positions of the
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10 May 2016, 07:56
Correct me if I am wrong.
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Re: In the figure above, segments RS and TU represent two positions of the
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24 Feb 2017, 03:23
Prompt analysis Let the length of ladder be x. SV = x sin 60. RV = x cos 60. TV = x cos 45 UV = x sin 45 TR = TV RV = x cos 45  x cos 60 SU = SV  UV = x sin 60  x sin 45. Super set The answer will be positive real number Translation To find the value of TVRV, we need: 1# exact value of TV and RV 2# exact value of x 3# exact value of any other length as the only variable is x Statement analysis St 1: x =10. TV = 10 cos 45 and RV = 10 cos 60. Tv Rv can be found St 2: rv = 5 = xcos 60. X = 10. Again TV RV can be found
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Re: In the figure above, segments RS and TU represent two positions of the
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14 Mar 2018, 02:02
How have we determined that RS=TU? Bunuel



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14 Mar 2018, 02:06




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