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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## In a certain solution, the ratio, by volume tagged by: Brent@GMATPrepNow ##### This topic has 3 expert replies and 3 member replies ## In a certain solution, the ratio, by volume In a certain solution, the ratio, by volume, of alcohol to soap to water was 60 : 3 : 120. The solution was altered such that the ratio of soap to the alcohol was halved while the ratio of alcohol to water was tripled. As a result, the volumes of water and soap in the solution increased. The ratio of the difference of the volumes of water in the original and the altered solutions to the difference of the volumes of soap in those solutions can be 1. 79 : 3 2. 80 : 3 3. 27 : 1 4. 82 : 3 5. 83 : 3 ### GMAT/MBA Expert GMAT Instructor Joined 04 Dec 2012 Posted: 2047 messages Followed by: 238 members Upvotes: 1443 When you're posting, please post the source and the OA (with the answer hidden for spoilers). This way we can evaluate whether the question is in fact a good question. This prompt, for example, is almost an exact plagiarization of OG #200, but with a bafflingly complicated question. The OG question simply asks for the new volume of water. This question asks what a ratio of the differences between various amounts "can be." That makes for a much more complicated and confusing question. If the original ratio was 60 : 3 : 120, and the ratio of soap to alcohol was halved, we would take (3/60)(1/2) and get 3/120. The ratio of alcohol to water tripled, though. Our original ratio was 60/120, or 1/2. Tripling that would give us a ratio of 3/2. So, if our new ratio unit of alcohol is 120, our ratio unit of water must be 80. Now the ratio we're looking for is: If we use the values we currently have, that would give us: We would have 0 in the denominator, which is impossible. So, let's try doubling all of the values in the new solution: Now, our ratio is: This would give us a ratio of 40 : 3. That's not an answer choice. We could try doubling the original instead, but again we get something that's not in the answer choices. This question would be FAR too laborious to actually solve on the real test. Mathematically, we could represent this ratio as: There is no way to simplify this, and thus no reasonable way of reaching an answer. The GMAT will never ask you to do something this complicated. Ignore this question, and ignore this source. _________________ Ceilidh Erickson Manhattan Prep GMAT & GRE instructor EdM in Mind, Brain, and Education Harvard Graduate School of Education Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience. Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry! Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week. ### GMAT/MBA Expert GMAT Instructor Joined 08 Dec 2008 Posted: 12822 messages Followed by: 1247 members Upvotes: 5254 GMAT Score: 770 I agree with Ceilidh; it's not a GMAT-quality question. Your source seems to take actual GMAT questions and add some bizarre twist to them. The original wording is as follows: Quote: The ratio , by volume, of soap to alcohol to water in a certain solution is 2:50:100. The solution will be altered so that the ratio of soap to alcohol will be doubled while the ratio of soap to water is halved. If the altered solution contain 100 cubic centimeters of alcohol, how many cubic centimeters of water will it contain? a) 50 b)200 c)400 d)625 e)800 Here's Mitch's succinct solution to the official question: http://www.beatthegmat.com/mixture-t110560.html Cheers, Brent _________________ Brent Hanneson â€“ Creator of GMATPrepNow.com Use our video course along with Sign up for our free Question of the Day emails And check out all of our free resources GMAT Prep Now's comprehensive video course can be used in conjunction with Beat The GMATâ€™s FREE 60-Day Study Guide and reach your target score in 2 months! ### Top Member Legendary Member Joined 03 Feb 2014 Posted: 2070 messages Followed by: 133 members Upvotes: 955 GMAT Score: 800 LLLLLOOOOOLLLLL I sat there for five minutes working toward an answer and finally couldn't take it any more and scrolled down to see if anyone else had actually found an answer. Meera you are surely great at finding the CRAZIEST questions on the planet. _________________ Marty Murray GMAT Coach m.w.murray@hotmail.com https://infinitemindprep.com/ In Person in the New York Area and Online Worldwide ### GMAT/MBA Expert GMAT Instructor Joined 04 Dec 2012 Posted: 2047 messages Followed by: 238 members Upvotes: 1443 Ha! I agree with Marty. Meera, what was your source? _________________ Ceilidh Erickson Manhattan Prep GMAT & GRE instructor EdM in Mind, Brain, and Education Harvard Graduate School of Education Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience. Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry! Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week. Newbie | Next Rank: 10 Posts Joined 16 Nov 2016 Posted: 1 messages Got some crazy answer. See attachment. Attachments This post contains an attachment. You must be logged in to download/view this file. Please login or register as a user. Master | Next Rank: 500 Posts Joined 15 Oct 2009 Posted: 326 messages Upvotes: 27 I also got 40/3 • Free Practice Test & Review How would you score if you took the GMAT Available with Beat the GMAT members only code • Free Trial & Practice Exam BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • Free Veritas GMAT Class Experience Lesson 1 Live Free Available with Beat the GMAT members only code • 1 Hour Free BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • Magoosh Study with Magoosh GMAT prep Available with Beat the GMAT members only code • 5 Day FREE Trial Study Smarter, Not Harder Available with Beat the GMAT members only code • Award-winning private GMAT tutoring Register now and save up to$200

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