If/then set up that counts number of "yes" responses

I have a unique scenario that hasn't crossed my path thus far. I need to have the ability to "count" the number of "yes" responses. Based on the responses, the user then see's a set slide. For example, if the user has more than 8 out of 10 "yes" responses, they go to the Congratulations slide. 

Furthermore, if they respond with 5-10 "yes" responses they go to the Keep Working slide, etc....

I've attached an example of the PowerPoint slides with notes from the author. See slides 14-16 for my comments.

Any recommendations would be huge and much appreciated.

Thank you, in advance!