Final answer:
To find out how many people are at the picnic, divide the total amount of lemonade, which is 6 3/4 cups or 6.75 cups, by the amount each person gets, which is 3/4 cups or 0.75 cups, resulting in 9 people.
Step-by-step explanation:
To determine how many people are at the picnic, we need to divide the total volume of lemonade by the volume each person receives.
We have 6 3/4 cups of lemonade, which is the same as 6.75 cups since 3/4 equals 0.75. If each person gets 3/4 cup (or 0.75 cup) of lemonade, we will divide the total amount of lemonade by the amount each person receives:
6.75 cups ÷ 0.75 cup/person = 9 people.
So, there are 9 people at the picnic.