求助一道GRE数学题

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Bottle A contains 7 liters of a mixture that is 12 percent water by volume...
Bottle B contains 8.5 liters of a mixture that is 10 percent water by volume. 比较The volume of bottle A 和 The volume of bottle B哪个大

看不懂percent water by volume这种很迷的表述,是某种道上的黑话?难道题目是说A的mixture占12%的体积,B的mixture占10%的体积?
附上,答案是B
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