20 millimeters=0.78 inches
http://wiki.answers.com/Q/A+line+20mm+is+how+many+...

20 millimeters is 0.787401574 inches. One millimeter is 0.039370079 inches. ChaCha! Ask away.
http://www.chacha.com/question/whatis20mminin...

20 millimeters is equal to 0.787401575 inches. Millimeters are a unit of the metric system.
http://www.kgbanswers.com/whatis20mmininches/4...

✐Derivation✐ 1 cm = 10 mm 2 cm = 20 mm 1 inch = 2.54 cm 2 cm = 0.7874 inches You solve the question, using the information that I gave you.
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