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The common denominator of the two fractions is: 20

$ \frac{4}{5 }= \frac{(4*4)}{(4*5)} =\frac{ 16}{20} $

$ \frac{7}{20 }= \frac{(1*7)}{(1*20)} =\frac{ 7}{20} $

Fractions adjusted to a common denominator

$ \frac{4}{5 }+\frac{ 7}{20 }=\frac{ 16}{20 }+\frac{ 7}{20} $

$ \frac{16}{20 }+\frac{ 7}{20 }= \frac{(7+16)}{20} $

$ \frac{(7+16)}{20 }=\frac{ 23}{20} $

$ $

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