1. **State the problem:** Solve the expression $\frac{y \times x}{6}$ given $c=12$ and $y=13$.\n\n2. **Identify the variables and formula:** The expression is $\frac{y \times x}{6}$. We know $y=13$, but $x$ is not given explicitly. The variable $c=12$ is given but not related to the expression unless $x=c$.\n\n3. **Assumption:** If $x=c=12$, then substitute $x=12$ and $y=13$ into the expression.\n\n4. **Substitute values:** $$\frac{13 \times 12}{6}$$\n\n5. **Simplify numerator:** $$\frac{156}{6}$$\n\n6. **Divide numerator by denominator:** $$\frac{\cancel{156}}{\cancel{6}} = 26$$\n\n7. **Final answer:** The value of the expression is $26$.