Answer
$\frac{35+6a}{15a}$
Work Step by Step
Given : $\frac{7}{3a} + \frac{2}{5}$
This becomes : $\frac{7\times5}{3a\times5} + \frac{2\times3a}{5\times3a}$
(After finding the least common denominator)
$= \frac{35}{15a} + \frac{6a}{15a}$
$=\frac{35+6a}{15a}$