an aquarium has 32 different habitats each habitat has between 15 to 24 fish what is the least greatest number of fish that they could have?

To determine the least greatest number of fish that the aquarium could have, let's analyze the question.

The aquarium has 32 different habitats, with each habitat containing between 15 and 24 fish.

To find the minimum and maximum number of fish:

1. **Minimum Number of Fish**:
- If each of the 32 habitats has the minimum number of fish (15), the calculation would be:
\[
32 \times 15 = 480 \text{ fish}
\]

2. **Maximum Number of Fish**:
- If each of the 32 habitats has the maximum number of fish (24), the calculation would be:
\[
32 \times 24 = 768 \text{ fish}
\]

So, the possible total number of fish in the aquarium can range from 480 fish (minimum) to 768 fish (maximum).

Now, checking your options:

1. **480 fish and 1,248 fish** - excess maximum.
2. **480 fish and 11,520 fish** - excessive maximum.
3. **480 fish and 768 fish** - valid range.
4. **360 fish and 480 fish** - 360 fish is below the minimum.

The least greatest number of fish that the habitats could have is **480 fish and 768 fish**. Hence, the correct answer is:

**480 fish and 768 fish.**