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How do I SUM values from separate screens?

I have a simple questionnaire where correct answers give you 1 point and wrong answers give you 0 points. Each screen has a separate question and designated value for each answer. The output value gets displayed on a text string as per the Variables Tutorial. This works as expected. However, my final screen wishes to recall these values and use it in an expression to sum the values. The problem I am having is that I am unable to figure out how to retrieve the value from the text boxes to be used in my formula.

 

Here is an example of the screens:

 

 




Screen Shot 2014-05-12 at 5.00.51 PM.png
Screen Shot 2014-05-12 at 5.01.02 PM.png
Screen Shot 2014-05-12 at 5.01.12 PM.png

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