Sandy can hold up to 320 ounces of lemonade for her school bake sale.
<h3>Further explanation</h3>
Volume is a property of all bodies, it represents how much space does a body occupy. This is a very important property when we wish to store something, because it's a matter of how much space does an object have. It is to be noted that the volume of an object, specially liquids, is independent of its mass.
Volumes are, in general, additive. This means that if we have, for example, 2 jars of 1 litre each, then we can store a total of 2 litres (1 litre in each jar). In order to solve our problem, we just need to add the volumes of each of Sandy's pitchers to know how much lemonade she can store, therefor:

Therefor Sandy can hold up to 320 ounces of lemonade.
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<h3>Keywords</h3>
volume, jar, store, addition