Final answer:
It would be better to use gallons when calculating how much water you need to make lemonade to sell because they can accommodate larger quantities of liquid and allow for easier scaling of the recipe.
Step-by-step explanation:
When calculating how much water you need to make lemonade to sell, it would be better to use gallons instead of cups. Gallons are a larger unit of measurement than cups, which means they can accommodate larger quantities of liquid.
For example, if you need to make a large batch of lemonade to sell at a school event, using cups would require many more measurements and calculations compared to using gallons. This can lead to more potential for errors and inconsistencies in your measurements.