Let $a, b, c$ be positive real numbers such that: $$ab - c = 3$$ $$abc = 18$$ Calculate the numerical value of $\frac{ab}{c}$
1. We start with the given equations:
   \[
   ab - c = 3
   \]
   \[
   abc = 18
   \]

2. From the first equation, we can express \( ab \) in terms of \( c \):
   \[
   ab = 3 + c
   \]

3. Substitute \( ab = 3 + c \) into the second equation:
   \[
   abc = 18
   \]
   \[
   c(3 + c) = 18
   \]

4. Simplify the equation:
   \[
   3c + c^2 = 18
   \]

5. Rearrange the equation to form a standard quadratic equation:
   \[
   c^2 + 3c - 18 = 0
   \]

6. Solve the quadratic equation using the quadratic formula \( c = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \), where \( a = 1 \), \( b = 3 \), and \( c = -18 \):
   \[
   c = \frac{-3 \pm \sqrt{3^2 - 4 \cdot 1 \cdot (-18)}}{2 \cdot 1}
   \]
   \[
   c = \frac{-3 \pm \sqrt{9 + 72}}{2}
   \]
   \[
   c = \frac{-3 \pm \sqrt{81}}{2}
   \]
   \[
   c = \frac{-3 \pm 9}{2}
   \]

7. This gives us two potential solutions for \( c \):
   \[
   c = \frac{6}{2} = 3
   \]
   \[
   c = \frac{-12}{2} = -6
   \]

8. Since \( c \) must be a positive real number, we discard \( c = -6 \) and keep \( c = 3 \).

9. Substitute \( c = 3 \) back into the expression for \( ab \):
   \[
   ab = 3 + c = 3 + 3 = 6
   \]

10. Finally, calculate \( \frac{ab}{c} \):
    \[
    \frac{ab}{c} = \frac{6}{3} = 2
    \]

The final answer is \( \boxed{2} \).