dv_dheeraj Posted November 13, 2008 Share Posted November 13, 2008 A total of 100 customers purchased books at a certain bookstore last week. If these customers purchased a total of 200 books, how many of the customers purchased only 1 book each? (1) None of the customers purchased more than 3 books. (2) 20 of the customers purchased only 2 books each. Quote Link to comment Share on other sites More sharing options...
supersuj Posted November 13, 2008 Share Posted November 13, 2008 IMO, C statement 1--> x+2y+3c=200 x+y+z=100 two equations, 3 unknowns - INSUFFICIENT statement 2--> y=20 no info on x...INSUFFICIENT (1)&(2), we get 3 equations, 3 unknowns - SUFFICIENT Quote Link to comment Share on other sites More sharing options...
ekvall Posted November 14, 2008 Share Posted November 14, 2008 Agree with supersuj, Set X = customers buying 3 books Books from customers buying 1 ea + books from customers buying 3 ea = 160 (200 - 2 * 20) (80 - x) + 3X = 160 2X = 80 X = 40 (120 books) Y= 40 (40 books) Quote Link to comment Share on other sites More sharing options...
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