acceptable range: 19.6-20.4 mm
Work Step by Step
$20 - .4 = 19.6$ $20 + .4 = 20.4 $
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.