Choice Ahoice C is the correct answer. When a variable is divided by a number, we multiply to solve.

1. Start with the equation: $\frac{x}{5} = 8$
2. Multiply both sides by 5: $x = 8 \times 5$
3. Calculate: $x = 40$
4. Verify: $\frac{40}{5} = 8$ ✓

💡 Key Strategy: Division equations like $\frac{x}{a} = b$ always have the solution $x = ab$. Multiply the number on the right by the divisor.

Choice Ahoice B is incorrect because this results from dividing 8 by 5 instead of multiplying: $\frac{8}{5} = 1.6$. This applies division again rather than using its inverse.

Choice Ahoice C is incorrect because this comes from adding: $8 + 5 = 13$. Addition is not the inverse of division.

Choice Ahoice D is incorrect because this results from subtracting: $8 - 5 = 3$. Subtraction doesn't undo division.