Question 1089685
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External dimensions

Length  24 + 2*0.125  = 24.25 in;
Width   24 + 2*0.125  = 24.25 in;
Height  18 +    0.125 = 18.125 in.   (No lid !)

Having this, calculate external volume.


Calculate internal volume.


Take the difference of volumes.

Then multiply by density.
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Good luck !