Answer: There are 25 people having one serving of lemonade ate her birthday party.
Step-by-step explanation:
Since we have given that
Total quantity of lemonade Lisa made for her birthday party = 6 liters
As we know that

Total quantity one serving of lemonade contains = 240 ml
Now, we need to find the number of people having one serving of lemonade ,
So,
Number of people is given by

So, there are 25 people having one serving of lemonade ate her birthday party.