The volume of the pan, which is a right rectangular prism is length • width • height: 12 • 4 • 6 = 288 cubic inches. That is also the volume of the water since the water is conpletely filled to the top.
If we have 1/3 of water left, that means 2/3 of the water was evaporated.
That means we will find 2/3 of the original volume of water (288 cubic inches): 2/3 x 288 = 192
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