If $x^3 =\large\frac{729}{2197} $ and $y^3=\large\frac{9261}{42875}$ then find $x+y$

Question

$\begin{array}{1 1} \large\frac{84}{56} \\ \large\frac{84}{55} \\ \large\frac{84}{65} \\ \large\frac{83}{65} \end{array} $