On this page of our guide to Life is Strange True Colors we've listed all of the side missions available in Episode 4.
Jelly Bean Counter
During the fourth episode you'll visit a festival. One of the attractions is a jar of jelly beans. The man you've already met in one of the sidequests from Episode 2 is trying his best with it. He has to guess (count?) how many beans there are in the jar.
You need to talk to him and ask how it's going.
Then look into the woman's thoughts and talk to her. It won't do any good, but you'll be able to talk to the man again.
He'll ask you for advice how many beans you suspect are in the jar. The correct answer is 800.
Look into the woman's thoughts again, she'll be terrified your guess was so close. She'll give you a hint, however. Once again talk to the man, this time choosing 700.
Now read her thoughts and talk to the man one last time. The correct answer is 731. Giving the correct answer will finish the quest.