Respuesta :

[tex]\cfrac{3}{5}+\cfrac{7}{8}\implies \cfrac{(8)3~~ + ~~(5)7}{\underset{\textit{using this LCD}}{40}}\implies \cfrac{24~~ + ~~35}{40}\implies \cfrac{59}{40}\implies {\Large \begin{array}{llll} 1\frac{19}{40} \end{array}}[/tex]