To solve the inequality \( 5x < 12 \), we first divide both sides by 5:
\[ x < \frac{12}{5} \]
Next, we convert the improper fraction \(\frac{12}{5}\) to a mixed number.
To do this, we divide 12 by 5:
- 5 goes into 12 two times (since \(5 \times 2 = 10\)).
- The remainder is \(12 - 10 = 2\).
Thus, we can express \(\frac{12}{5}\) as:
\[ 2 \frac{2}{5} \]
Now we can write the final answer with \( x \) first:
\[ x < 2 \frac{2}{5} \]