Chapter 5 - Number Theory and the Real Number System - 5.3 The Rational Numbers - Exercise Set 5.3 - Page 285: 71

$\dfrac{ 5 }{ 11 }$

\begin{align} \dfrac{ 2 }{ 11 } + \dfrac{ 3 }{ 11 } &= \dfrac{ 2 + 3 }{ 11 } &&\text{Since they have the same denominators, add the numerators}\\ &= \boxed{ \dfrac{ 5 }{ 11 } } &&\text{Evaluate} \end{align}