To create a whole number by adding, subtracting, multiplying, or dividing the numbers 3.1, 3.7, and 2.5, you need to combine them in a way that results in an integer.

One possible way is:

$3.7 + 3.1 - 2.5 = 4.3$

However, this is not a whole number. So, we need a different approach.

Let's try:

$(3.1 + 3.7) \times 2.5 = 6.8 \times 2.5 = 17$

This combination results in 17, which is a whole number.

Would you like more details or have any other questions?

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Here are 8 related questions to explore:

1. Can you find another combination of operations that gives a different whole number?
2. What happens if you use only addition with these numbers?
3. How does subtraction between these numbers affect the result?
4. Can multiplying two of these numbers and adding the third give another whole number?
5. What is the result of dividing one number by another in this set?
6. How can you create the smallest whole number using these three numbers?
7. Can these numbers be used to create a whole number by only using division?
8. How would the outcome change if one of the numbers was slightly different?

Tip: When working with decimals, multiplication and division often give whole numbers if the decimals complement each other correctly.