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The common denominator of the two fractions is: 60

$ \frac{14}{15 }= \frac{(4*14)}{(4*15)} =\frac{ 56}{60} $

$ \frac{13}{20 }= \frac{(3*13)}{(3*20)} =\frac{ 39}{60} $

Fractions adjusted to a common denominator

$ \frac{14}{15 }+\frac{ 13}{20 }=\frac{ 56}{60 }+\frac{ 39}{60} $

$ \frac{56}{60 }+\frac{ 39}{60 }= \frac{(39+56)}{60} $

$ \frac{(39+56)}{60 }=\frac{ 95}{60} $

$ \frac{95}{60 }=\frac{ 19}{12} $

$ $

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