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Multiple Choice

There are 400 cardboard boxes in a truck. Some of the boxes are large and some are small. The total mass of the boxes is 3540 kg. The mass of a large box is 12 kg and the mass of a small box is 5 kg. What is the ratio of the numbers of small boxes to large boxes?

  1. 9 : 20
  2. 11 : 9
  3. 9 : 11
  4. 20 : 9
  5. -
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