If you have a length of 25 mm and then 12 mm it makes a length of 37 mm.
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45 mm is thicker than 25 mm
The answer depends on the units used for the 12s. Clearly a 12 yard * 12 yard * 12 yard box will have more cubic feet than a 12 mm * 12 mm * 12 mm box.
25mm = 3.973 kg/m
45 mm is bigger
35 mm