Robin noticed her water bottle was 3 full and Freddy's was full. Robin said, "My full bottle has more water than your full bottle." Explain how bottle could be more than 2 bottle.

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One of the bottles has a greater total volume than the other. for example, if one bottle is 20 ounces and the other is 100 ounces, when the 100 ounce bottle is 3/4 full there are 75 ounces of fluid inside which is more than the total amount of fluid in the full 20 ounce bottle.