Seven-year-old Rebecca knows that if you put one cup of water in a tall vase and another cup of water in a round, short vase, that you still have one cup of water in each vase. Rebecca understands __________ .

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The Answer of Seven-year-old Rebecca knows that if you put one cup of water in a tall vase and another cup of water in a round, short vase, that you still have one cup of water in each vase. Rebecca understands __________ .

Seven-Year-Old Rebecca Knows That If You Put One Cup of Water