The complete statement is 30.9mm = 1. 21 in
Conversion of units is simply the conversion between different units of measurement for a particular quantity.
Given the statement;
30.9mm = in
It is important to note that;
25. 4 millimeters = 1 inch
Then;
30. 9 millimeters = x inches
Cross multiply
x × 25. 4 = 30. 9 × 1
To make 'x' the subject
Divide both sides by 25. 4, we have;
x = 30. 9/ 25. 4
x = 1. 21 Inches
Thus, the complete statement is 30.9mm = 1. 21 in
Learn more about converting units here:
https://brainly.com/question/8426032
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