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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 ## mixed % ##### This topic has 5 member replies ## mixed % X grams of water were added to the 80 grams of a strong solution of acid. As a result, the concentration of acid in the solution became 1/Y times of the initial concentration. What was the concentration of acid in the original solution? 1. X = 80 2. Y = 2 Master | Next Rank: 500 Posts Joined 03 Sep 2008 Posted: 377 messages Followed by: 2 members Upvotes: 15 Target GMAT Score: 700+ Ans is E based on given condition we have - let c1 be concentration wt. of solute in the mixture = 80c1/100 gm hence the new concentration c2 after adding X gm of water ((80c1/100) * 100) / (80+x) = c2 = c1/Y hence we get, 80y = 80+x From 1, we get x = 80 and y =2 but we still cant find the concentration From 2, same as above Hence E Junior | Next Rank: 30 Posts Joined 15 Aug 2008 Posted: 12 messages I think the OA is C. Can somebody please verify. This is how - Let the solution contain Z gms of Acid. Thus concentration is Z/80 X gms water added, thus total solution = 80 + X Thus concentration is Z/(80+X) Z/(80+X) = (1/Y)(Z/80) 1) X = 80. Insufficient 2) Y = 2. Insufficient Replacing both X and Y gives us the vlaue of Z. And thus can find Z/80 Answer is C Newbie | Next Rank: 10 Posts Joined 19 Jul 2008 Posted: 7 messages Upvotes: 1 lali_mew, Z/160=Z/160 after replacing x and y. Z can be any value, so you can't find the concentration. IMO E Please correct me if I'm wrong. Legendary Member Joined 22 Jul 2008 Posted: 683 messages Followed by: 2 members Upvotes: 73 Agree with fatalmilk The answer should be E as both the statements gives us the same information. Junior | Next Rank: 30 Posts Joined 15 Aug 2008 Posted: 12 messages You are right fatalmilk! I overlooked that point. Both sides amount to the same. The answer is E. Thanks for pointing it out. • 5-Day Free Trial 5-day free, full-access trial TTP Quant Available with Beat the GMAT members only code • Free Practice Test & Review How would you score if you took the GMAT Available with Beat the GMAT members only code • 5 Day FREE Trial Study Smarter, Not Harder Available with Beat the GMAT members only code • 1 Hour Free BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • Free Trial & Practice Exam 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 • Get 300+ Practice Questions 25 Video lessons and 6 Webinars for FREE Available with Beat the GMAT members only code • FREE GMAT Exam Know how you'd score today for$0

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