Hi -- in your conditional formatting, change the first drop down of the last condition to The expression and then you can add to the existing expression with or or and to effectively add multiple conditions.
For example, if your current condition expression was:
my:myFields/my:Answer1 = 12
You could add to that:
my:myFields/my:Answer1 = 12 or my:myFields/my:Answer2 = 13 or my:myFields/my:Answer3 = 14
That's three conditions right there, but it looks like just one to InfoPath!