Formulas and calculations

I have in my course, the need to have the user type in a rating into two different sets of 5 questions. I need to take their response to each of the Q1s and add them together and then divide by 2, same for Q2s, Q3s, Q4s and Q5s. Then I want those results (there will be 5 of them) to display after they click on a button that says show me my score. How do I do this - its over my head.

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