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A bookstore had 30816 exercise books which were packed in cartons. Each carton contained 24 exercise books . The mass of an empty carton was 2kg and a full carton 12kg.

  1. How many cartons were there?
  2. What was the total mass of the empty cartons? 
  3. What was the total mass of the books alone?

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  1. How many cartons were there? 
    30816/24=1284
  2. What was the total mass of the empty cartons? 
    1284 x 2=2568
  3. What was the total mass of the books alone? 
    12-2=10kg
    1284 x 10=12840kg

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