Answer:
Carly has 17 jerseys
Explanation:
Here, we want to know the number of jerseys Carly has
Let the number of jersey Carly has be c
Armond has 3 times what Carly has. The number of jerseys Armond has will be 3 * c = 3c
Carly has 5 more jerseys than Mandy; this means that the number of jerseys Mandy has is c-5 jerseys
Adding all, we have 80 jerseys
Thus;
c + 3c + c-5 = 80
5c -5 = 80
5c = 80 + 5
5c = 85
c = 85/5
c = 17