Final answer:
To find how many sour candies Carmen has now, subtract the number of candies she ate from the total number of candies she bought.
Step-by-step explanation:
In this problem, we are given that Carmen bought a bag of 92 sour candies and ate s of the candies. To find how many sour candies Carmen has now, we need to subtract the number of candies she ate from the total number of candies she bought. We can write this as the expression 92 - s.