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A certain expressway has Exits J, K, L, and M, in that order
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30 Jul 2012, 01:12
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The Official Guide for GMAT® Review, 13th Edition  Quantitative Questions ProjectA certain expressway has Exits J, K, L, and M, in that order. What is the road distance from Exit K to Exit L ? (1) The road distance from Exit J to Exit L is 21 kilometers. (2) The road distance from Exit K to Exit M is 26 kilometers. Practice Questions Question: 6 Page: 275 Difficulty: 600 GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition  Quantitative Questions ProjectEach week we'll be posting several questions from The Official Guide for GMAT® Review, 13th 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: A certain expressway has Exits J, K, L, and M, in that order
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03 Aug 2012, 04:36
SOLUTIONA certain expressway has Exits J, K, L, and M, in that order. What is the road distance from Exit K to Exit L ?Attachment:
JKLM.png [ 1.32 KiB  Viewed 11203 times ]
(1) The road distance from Exit J to Exit L is 21 kilometers. JL=21, so JK+KL=21. Not sufficient. (2) The road distance from Exit K to Exit M is 26 kilometers. KM=26, so KL+LM=26. Not sufficient. (1)+(2) We have two distinct linear equations with three unknowns, hence we cannot solve for any of them. Not sufficient. Answer: E.
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Geometry Lines
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25 Nov 2012, 13:27
A certain espressway has exits J,K,L, and M, in that order. What is the road distance from exit K to Exit L?
1. The road distance from exit J to Exit L is 21 KM
2. The road distance from exit K to exit M is 26 KM
Please give a brief shortcut/or thoughts as to how to eliminate possible answers.
Thanks!



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Re: Geometry Lines
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25 Nov 2012, 15:20
JKLM We know the distance between J and L We know the distance between K and M Neither of these tells us anything about the distance between K and L > A, B, D incorrect The two statements put together allso tell us nothing about the distance between K and L > C incorrect E is correct Look at this another way, taking a dash for 5 units, and approximating, you can diagram (I) and (II) together as: JKLM OR JKLM OR JKLM Hence E I don't have a simpler explanation, I'm afraid.
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Re: Geometry Lines
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Re: A certain expressway has Exits J, K, L, and M, in that order
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02 Jul 2014, 19:41
Bunuel wrote: SOLUTIONA certain expressway has Exits J, K, L, and M, in that order. What is the road distance from Exit K to Exit L ?Attachment: JKLM.png (1) The road distance from Exit J to Exit L is 21 kilometers. JL=21, so JK+KL=21. Not sufficient. (2) The road distance from Exit K to Exit M is 26 kilometers. KM=26, so KL+LM=26. Not sufficient. (1)+(2) We have two distinct linear equations with three unknowns, hence we cannot solve for any of them. Not sufficient. Answer: E. Can`t I say (1)+(2): (1)JL + LM = 21+LM (2)KM +KJ = 26 + KJ (1)+(2) = 21+Lm = 26+KJ LMKJ = 5 so KL=5 ?



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Re: A certain expressway has Exits J, K, L, and M, in that order
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03 Jul 2014, 04:49
Reni wrote: Bunuel wrote: SOLUTIONA certain expressway has Exits J, K, L, and M, in that order. What is the road distance from Exit K to Exit L ?(1) The road distance from Exit J to Exit L is 21 kilometers. JL=21, so JK+KL=21. Not sufficient. (2) The road distance from Exit K to Exit M is 26 kilometers. KM=26, so KL+LM=26. Not sufficient. (1)+(2) We have two distinct linear equations with three unknowns, hence we cannot solve for any of them. Not sufficient. Answer: E. Can`t I say (1)+(2): (1)JL + LM = 21+LM (2)KM +KJ = 26 + KJ (1)+(2) = 21+Lm = 26+KJ LMKJ = 5 so KL=5 ? The point is that LM  KJ does NOT equal to KL.
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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: A certain expressway has Exits J, K, L, and M, in that order
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22 Jul 2016, 10:57
Bunuel wrote: The Official Guide for GMAT® Review, 13th Edition  Quantitative Questions ProjectA certain expressway has Exits J, K, L, and M, in that order. What is the road distance from Exit K to Exit L ? (1) The road distance from Exit J to Exit L is 21 kilometers. (2) The road distance from Exit K to Exit M is 26 kilometers. Solution: Let's first put the given information into a diagram. We can also define variables for the distances between J and K, K and L, and L and M. Distance from J to K = x Distance from K to L = y Distance from L to M = z We are asked to determine the road distance from Exit K to Exit L. Thus, we need to determine the value of y. Statement One Alone:The road distance from Exit J to Exit L is 21 kilometers. Statement one tells us that x + y = 21. This is not enough information to answer the question. Statement one alone is not sufficient. Eliminate answer choices A and D. Statement Two Alone:The road distance from Exit K to Exit M is 26 kilometers. Statement two tells us that y + z = 26. This is not enough information to answer the question. Statement two alone is not sufficient. Eliminate answer choice B. Statements One and Two Together:From statements one and two we know the following: x + y = 21 and y + z = 26 Since this is not enough to determine the value of y, we cannot answer the question. Answer: E
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Re: A certain expressway has Exits J, K, L, and M, in that order
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19 Jul 2018, 23:21
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