[tex]2 \frac{1}{5} + 1 \frac{3}{5} = 3 \frac{4}{5} [/tex]
[tex] \frac{5}{7} + \frac{6}{7} = \frac{11}{7} = 1 \frac{4}{7} [/tex]
[tex] \frac{2}{3} + \frac{5}{6} = 1 \frac{1}{2} [/tex]
