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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 ## At 15:00 there were 20 students ##### This topic has 1 expert reply and 0 member replies ## At 15:00 there were 20 students At 15:00 there were 20 students in the computer lab. At 15:03 and every three minutes after that, 3 students entered the lab. If at 15:10 and every ten minutes after that 8 students left the lab, how many students were in the computer lab at 15:44 ? A. 7 B. 14 C. 25 D. 27 E. 30 OA: E ### GMAT/MBA Expert Legendary Member Joined 14 Jan 2015 Posted: 2667 messages Followed by: 122 members Upvotes: 1153 GMAT Score: 770 NandishSS wrote: At 15:00 there were 20 students in the computer lab. At 15:03 and every three minutes after that, 3 students entered the lab. If at 15:10 and every ten minutes after that 8 students left the lab, how many students were in the computer lab at 15:44 ? A. 7 B. 14 C. 25 D. 27 E. 30 OA: E The number of 3 minute intervals between 15:03 and 15:44 will be the number of multiples of 3 between 3 and 42 inclusive. (42 is the greatest multiple of 3 that is less than 44.) There are 14 of those, so 14*3 =42 students enter the lab. Between 15:10 and 15:44, there were 4 intervals of 10 minutes, so 4*8 = 32, students leave the lab. The net change is 42 - 32 = 10. We started with 20 students, so we'll have 20 + 10 = 30 at 15:44. The answer is E _________________ Veritas Prep | GMAT Instructor Veritas Prep Reviews Save$100 off any live Veritas Prep GMAT Course

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