Step-by-step explanation:
Jonathan finds a piece of metal that is 2[tex]\frac{1}{5}[/tex] inches thick.
The thickness of the metal = 2[tex]\frac{1}{5}[/tex] = [tex]\frac{11}{5}[/tex]
He files off [tex]\frac{3}{10}[/tex] inch,
the thickness becomes = [tex]\frac{11}{5}[/tex] - [tex]\frac{3}{10}[/tex] = [tex]\frac{19}{10}[/tex]
He adds a protective covering to the metal that is [tex]\frac{2}{10}[/tex] inch thick.
the thickness becomes, [tex]\frac{19}{10}[/tex] + [tex]\frac{2}{10}[/tex] = [tex]\frac{21}{10}[/tex]
Then, he polishes the metal and removes an additional [tex]\frac{1}{10}[/tex] inch.
The final thickness becomes, [tex]\frac{21}{10}[/tex] - [tex]\frac{1}{10}[/tex] = 2 inches
