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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 ## If x must be divisible by both 4 and 10, then... tagged by: BTGmoderatorLU ##### This topic has 2 expert replies and 0 member replies ### Top Member ## If x must be divisible by both 4 and 10, then... If x must be divisible by both 4 and 10, then x must also be divisible by which of the following numbers? A. 8 B. 20 C. 40 D. 50 E. 80 The OA is B. I don't understand this PS question. Please, can any expert assist me with it? Thanks. ### GMAT/MBA Expert GMAT Instructor Joined 25 May 2010 Posted: 15386 messages Followed by: 1872 members Upvotes: 13060 GMAT Score: 790 LUANDATO wrote: If x must be divisible by both 4 and 10, then x must also be divisible by which of the following numbers? A. 8 B. 20 C. 40 D. 50 E. 80 Let x = the least common multiple of 4 and 10 = 20. Since x=20 is not divisible by 8, 40, 50, or 80, eliminate A, C, D and E. The correct answer is B. _________________ 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. ### GMAT/MBA Expert GMAT Instructor Joined 04 Oct 2017 Posted: 551 messages Followed by: 11 members Upvotes: 180 Quote: If x must be divisible by both 4 and 10, then x must also be divisible by which of the following numbers? A. 8 B. 20 C. 40 D. 50 E. 80 The OA is B. I don't understand this PS question. Please, can any expert assist me with it? Thanks. Hi LUANDATO, Let's take a look at your question. The number that is divisible by both 4 and 10 must the least common multiple of both. Let's first find LCM of 4 and 10. Multiples of 4 = 4, 8, 12, 16, 20, ... Multiples of 10 = 10, 20, 30, 40, ... LCM = 20 Now 20 is divisible by both 4 and 10. We need to check that which of the given options is divisible by 20. OPTION A: 8 is not divisible by 20. So Option A is not correct. OPTION B: 20 is divisible by 20. Therefore, Option B is correct. Hope it helps. I am available if you'd like any follow up. _________________ GMAT Prep From The Economist We offer 70+ point score improvement money back guarantee. Our average student improves 98 points. Free 7-Day Test Prep with Economist GMAT Tutor - Receive free access to the top-rated GMAT prep course including a 1-on-1 strategy session, 2 full-length tests, and 5 ask-a-tutor messages. Get started now. • FREE GMAT Exam Know how you'd score today for$0

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