Mr. Karim purchased TK. 600 worth of traveler's cheques. If each cheque was worth either TK. 20 or TK. 50, which of the following cannot be the number of TK. 20 cheques purchased ?

Mr. Karim purchased TK. 600 worth of traveler's cheques. If each cheque was worth either TK. 20 or TK. 50, which of the following cannot be the number of TK. 20 cheques purchased ? Correct Answer 18

10*20 = 200...rest 400 is divisible by 50 15*20 = 300...rest 300 is divisible by 50 20*20 = 400...rest 200 is divisible by 50 but 18*20 = 360...rest 240 is not divisible by 50 ans 18

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Jane, Karim and Leo checked out books from the library. Jane has an even number of library books . Karim has 3 more library books than Jane . Leo has 2 more library books than Karim. Which statement is true about the number of library books Karim and Leo have ?