To find the amount of money each person received from the total of $215.40, you need to divide the total amount by the number of people participating in the yard sale. Since Marsha, Nick, and 3 friends make a total of 5 people, the correct equation to find \( s \), the amount each person received, would be:
\[ 5s = 215.40 \]
So, the correct response is:
5s = 215.40