A milk tank is in the form of a cylinder whose radius is 1.5 m and length is 7 m. Find the quantity of milk in litres that can be stored in the tank.

Answer

To find the quantity of milk that can be stored in a cylindrical tank, we need to calculate the volume of the cylinder using the formula for the volume of a cylinder, which is given by:

\[ V = \pi r^2 h \]

Where:
- \( V \) is the volume,
- \( r \) is the radius of the cylinder,
- \( h \) is the height (or length) of the cylinder.

### Step-by-Step Solution:

1. **Identify the given values:**
- Radius \( r = 1.5 \) m
- Height \( h = 7 \) m

2. **Substitute the values into the volume formula:**
\[ V = \pi (1.5)^2 (7) \]

3. **Calculate \( r^2 \):**
\[ (1.5)^2 = 2.25 \]

4. **Substitute \( r^2 \) back into the volume formula:**
\[ V = \pi (2.25) (7) \]

5. **Calculate \( 2.25 \times 7 \):**
\[ 2.25 \times 7 = 15.75 \]

6. **Now substitute the value of \( \pi \):**
We can use \( \pi \approx \frac{22}{7} \) for calculation.
\[ V = \frac{22}{7} \times 15.75 \]

7. **Calculate \( \frac{22}{7} \times 15.75 \):**
\[ V = \frac{22 \times 15.75}{7} = \frac{346.5}{7} = 49.5 \text{ m}^3 \]

8. **Convert cubic meters to liters:**
Since \( 1 \text{ m}^3 = 1000 \text{ liters} \):
\[ V = 49.5 \text{ m}^3 \times 1000 = 49500 \text{ liters} \]

### Final Answer:
The quantity of milk that can be stored in the tank is **49500 liters**.