Assuming the two are measurements of thickness, it should be obvious that 30 mm is thicker!
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45 mm is thicker than 25 mm
None but 20 mm = 2 cm
3.4 cm equals 34 mm which is greater than 30 mm
.953 mm (USG)
1 cm = 10 mm 20 cm x 10 = 200 mm 200 - 20 = 180 mm = 18 cm