1. **State the problem:** We are given the harmonic mean (HM) and geometric mean (GM) of two numbers and need to find the two numbers.
2. **Given:**
- Harmonic mean $HM = \frac{24}{5}$
- Geometric mean $GM = 6$
3. **Recall formulas:**
- Harmonic mean of two numbers $x$ and $y$ is given by:
$$HM = \frac{2xy}{x+y}$$
- Geometric mean is:
$$GM = \sqrt{xy}$$
4. **Use the GM to find the product:**
$$\sqrt{xy} = 6 \implies xy = 6^2 = 36$$
5. **Use the HM to find the sum:**
$$\frac{2xy}{x+y} = \frac{24}{5} \implies \frac{2 \times 36}{x+y} = \frac{24}{5}$$
6. **Solve for $x+y$:**
$$\frac{72}{x+y} = \frac{24}{5} \implies 72 \times 5 = 24 (x+y) \implies 360 = 24 (x+y)$$
$$x+y = \frac{360}{24} = 15$$
7. **Now we have:**
$$x+y = 15$$
$$xy = 36$$
8. **Find the numbers by solving the quadratic:**
$$t^2 - (x+y)t + xy = 0 \implies t^2 - 15t + 36 = 0$$
9. **Calculate the discriminant:**
$$\Delta = 15^2 - 4 \times 36 = 225 - 144 = 81$$
10. **Find roots:**
$$t = \frac{15 \pm \sqrt{81}}{2} = \frac{15 \pm 9}{2}$$
11. **Two numbers:**
$$t_1 = \frac{15 + 9}{2} = 12$$
$$t_2 = \frac{15 - 9}{2} = 3$$
**Answer:** The two numbers are $12$ and $3$.
Harmonic Geometric Means
Step-by-step solutions with LaTeX - clean, fast, and student-friendly.