To solve the inequality \( \frac{x}{13} < \frac{4}{5} \), we start by isolating \( x \):
- Multiply both sides of the inequality by 13 to eliminate the fraction:
\[ x < \frac{4}{5} \times 13 \]
- Calculate \( \frac{4}{5} \times 13 \):
\[ \frac{4 \times 13}{5} = \frac{52}{5} \]
- Therefore, the solution to the inequality is:
\[ x < \frac{52}{5} \]
In decimal form, \( \frac{52}{5} \) is \( 10.4 \).
Looking at the options provided, the correct choice is:
x < 10 Start Fraction 2 over 5 End Fraction (which is equivalent to \( x < \frac{52}{5} \)).