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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 ## Working together, Machine A and Machine B can produce a tota ##### This topic has 1 expert reply and 0 member replies ### Top Member ## Working together, Machine A and Machine B can produce a tota ## Timer 00:00 ## Your Answer A B C D E ## Global Stats Difficult Working together, Machine A and Machine B can produce a total of 200 widgets in 4 hours. How many hours would it take Machine A, working alone, to produce 200 widgets? (1) Working alone, Machine B takes 5 hours to produce 50 widgets. (2) Machine A can produce 4 widgets in the same amount of time it takes Machine B to produce 1 widget. OA D Source: Magoosh ### GMAT/MBA Expert GMAT Instructor Joined 25 May 2010 Posted: 15362 messages Followed by: 1866 members Upvotes: 13060 GMAT Score: 790 Top Reply BTGmoderatorDC wrote: Working together, Machine A and Machine B can produce a total of 200 widgets in 4 hours. How many hours would it take Machine A, working alone, to produce 200 widgets? (1) Working alone, Machine B takes 5 hours to produce 50 widgets. (2) Machine A can produce 4 widgets in the same amount of time it takes Machine B to produce 1 widget Since A+B take 4 hours to produce 200 widgets, the combined rate for A+B = w/t = 200/4 = 50 widgets per hour. To determine A's time to produce 200 widgets, we need to know A's rate. Question stem, rephrased: What is A's rate? Statement 1: Since B takes 5 hours to produce 50 widgets, B's rate = w/t = 50/5 = 10 widgets per hour. Thus, A's rate = (rate for A+B) - (B's rate) = 50-10 = 40 widgets per hour. SUFFICIENT. Statement 2: For every 1 widget produced by B, A produces 4 widgets. Thus: Of every 5 widgets produced when A+B work together, A produces 4 widgets, with the result that A produces 4/5 of the hourly number of widgets. Since the combined rate for A+B = 50 widgets per hour, we get: A's rate = (4/5)(50) = 40 widgets per hour. SUFFICIENT. The correct answer is D. _________________ 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. • Free Practice Test & Review How would you score if you took the GMAT 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 Veritas GMAT Class Experience Lesson 1 Live Free 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 5-day free, full-access trial TTP Quant Available with Beat the GMAT members only code • 5 Day FREE Trial Study Smarter, Not Harder Available with Beat the GMAT members only code • FREE GMAT Exam Know how you'd score today for$0

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