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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 ## Weighted Average problem? ##### This topic has 1 expert reply and 1 member reply ## Weighted Average problem? How to solve? ### GMAT/MBA Expert GMAT Instructor Joined 25 May 2010 Posted: 15353 messages Followed by: 1864 members Upvotes: 13060 GMAT Score: 790 GHong14 wrote: How to solve? If equal amounts of X and Y are combined (150 grams of each), the percentage of protein in the resulting mixture would be (10+15)/2 = 12.5%, resulting in .125*300 = 37.5 grams of protein. Since the mixture contains just a bit more protein (38 grams), it must include a bit more than 150 grams of Y, which contains a higher percentage of protein, and a bit less than 150 grams of X, which contains a lower percentage of protein. The correct answer is B. Alternatively, we could plug in the answer choices for the amount of X contained in the mixture: Answer choice B: 140 grams X, 160 grams Y .1*140 = 14 .15*160 = 24 14+24 = 38. Success! _________________ Mitch Hunt Private Tutor for the GMAT and GRE GMATGuruNY@gmail.com If you find one of my posts helpful, please take a moment to click on the "UPVOTE" icon. Available for tutoring in NYC and long-distance. For more information, please email me at GMATGuruNY@gmail.com. Student Review #1 Student Review #2 Student Review #3 Free GMAT Practice Test How can you improve your test score if you don't know your baseline score? Take a free online practice exam. Get started on achieving your dream score today! Sign up now. Master | Next Rank: 500 Posts Joined 16 Oct 2010 Posted: 182 messages Upvotes: 4 x+y=300 i.e x=300-y 0.1 x + 0.15y= 38 0.1 (300-y) + 0.15y =38 30 - 0.1y + 0.15y=38 0.05y = 8 y= 160 x= 300-160 = 140 • 5-Day Free Trial 5-day free, full-access trial TTP Quant 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 GMAT Exam Know how you'd score today for$0

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