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There are 20 students in a class. they sit in pairs so that exactly one third of the boys sit with a girl, and exactly one half of the girls sit with a boy. total how many boys are there in the class?i am not sure how to work this question out algebraically. can i have some help please? |
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GMAT Club Rules Login Username Password Register Forgot password? Close Search Close GMAT Club Forum Index Data Sufficiency (DS) There were n BOYS and m girls in a class. : Data Sufficiency (DS) TAGS DarshilPandya Jun 18, 2018 00:00ABCDE DIFFICULTY: 65% (hard) QUESTION STATS: based on 173 sessions 53% (01:36) correct 47% (01:46) wrong There were n boys and m girls in a class. They wanted to sit in a row for an activity. In how many ways can they sit on 30 chairs? I. n+3m = 20 II. 2n + 2m = 22 Spoiler: OA Kudos 0 kudos, 7 bookmarks GMATBusters EXPERT'S POST Jun 18, 2018 There were n boys and m girls in a class. They wanted to sit in a row for an activity. In how many ways can they sit on 30 chairs? To find the number of ways , we need the total number of students. If N is total number of students, Number of ways will be I. n+3m = 20 Value of (n, m) can be (2,6) or (5,5) or (8,4) So N = n+m= 8 or 10 or 12. NOT SUFFICIENT. II. 2n + 2m = 22 N= n+m = 11 SUFFICIENT. Answer B _________________ GMATBusters Quant Quizzes are back with a BANG- Win Prizes WORTH more than 500$ Book online tutoring session |
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