International Business Machines (IBM) Question: Suppose if clerk can process 80 cheques in half an hour, how many cheques can she process in a seven and one half hour day? IBM Interview QuestionAnswer: 1200 Previous QuestionNext QuestionIf cost of four dozen proof machine ribbons and five dozen accounting machine ribbons was Rs.160/-. If one dozen accounting machine ribbons cost Rs.20/-, what is cost of a dozen proof machine ribbons?In library, there are two racks with 40 books per rack. On dya, 30 books were issued. What fraction remained in racks?