Answer: 12.5 cm or 125 mm
Explanation:
Given: [tex]\frac{5}{8}\ of\:20[/tex]
[tex]\frac{5}{8}\cdot \:20[/tex]
[tex]\frac{5\cdot \:20}{8\cdot \:1}[/tex]
[tex]\frac{100}{8}[/tex]
[tex]\frac{50}{4}[/tex]
[tex]\frac{25}{2}[/tex]
[tex]12.5 cm[/tex]
Conversion:
1 cm --> 10 mm
12.5 cm --> ( 12.5 * 10 ) mm
12.5 cm --> 125 mm