It seems like there might be a misunderstanding in your question. You mentioned a minimum of 149 and a maximum that is "not 660," and then asked to work out the maximum. To clarify:

1. If you mean that the maximum value cannot be 660, then you would need to provide more information or context to determine the actual maximum.
2. If you meant to ask for the next possible maximum value below 660, then it could be anything less than 660, depending on the given constraints.

Could you please provide more context or clarify your question so I can assist you better?

If you have any questions, feel free to ask. Here are some related questions:

1. What is the range between the minimum and maximum values?
2. Are there any constraints on what the maximum can be?
3. How would you determine the maximum in a set of values?
4. What is the importance of the maximum value in your context?
5. How can the maximum value be influenced by other factors?

Tip: Always double-check the constraints and requirements when working with minimum and maximum values to avoid confusion.