Jeremy has a backpack, but he wants to buy a bigger one, with a capacity from 45 to 55 L. He hesitates between two models. The capacity of Model A is 2 times larger than that of the backpack he already has. As for model B, it can contain 15 L more than his daypack. If we added 18 L to the capacity of model A and 28 L to the capacity of model B, both models would have exactly the same capacity. Which of the two models should Jeremy choose?

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