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The common denominator of the two fractions is: 20

$ \frac{1}{5 }= \frac{(1*4)}{(4*5)} =\frac{ 4}{20} $

$ \frac{3}{20 }= \frac{(1*3)}{(1*20)} =\frac{ 3}{20} $

Fractions adjusted to a common denominator

$ \frac{1}{5 }+\frac{ 3}{20 }=\frac{ 4}{20 }+\frac{ 3}{20} $

$ \frac{4}{20 }+\frac{ 3}{20 }= \frac{(3+4)}{20} $

$ \frac{(3+4)}{20 }=\frac{ 7}{20} $

$ $

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