Final answer:
The amount of additional scoops of flavor for a drink ordered extra sweet is not specified in the provided information. Additional context or company policy is needed to answer accurately.
Step-by-step explanation:
When a drink is ordered extra sweet, the specific amount of additional scoops of flavor per 'extra sweet' is not provided in the referenced study about the sugar content in two different soft drinks. To answer the question accurately, additional context or a standard from a specific restaurant or company policy would be required. However, using the provided examples, we can make a conceptual connection: if adding more sugar makes a beverage sweeter, then a sweet beverage ordered 'extra sweet' would have an increased amount of sugar or flavoring scoops compared to the standard serving.