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Impossible to say without knowing three things: the kind of container it's in, the ambient air temperature, and the starting temperature of the water. A cup of boiling water in a sealed thermos that someone put in an oven heated to 100 degrees will take far longer to cool to 78 degrees F (in fact, it never will cool to 78 degrees; it can't get any colder than the ambient air temp, which is 100 degrees) than a cup of 80-degree water in an aluminum canteen cup you stuck in the freezer.

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11y ago

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9 and 3/4 cups

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Wiki User

15y ago
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There are 9.75 cups of water in 78 ounces.

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AnswerBot

10mo ago
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Q: How many cups of water equals 78 ounces?
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