Answer
$$\frac{28a}{5b}$$
Work Step by Step
A common denominator of $b$ and $5b$ is $5b$, so
$$\frac{5a}{b}+\frac{3a}{5b}=\bigg(\frac{5a}{b}\bigg)\bigg(\frac{5}{5}\bigg)+\frac{3a}{5b}=\frac{25a}{5b}+\frac{3a}{5b}=\frac{28a}{5b}.$$
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