Answer:
There were 25 guest in Dan's party.
Explanation:
We are given the following information in the question:
Number of classmates came to Dan’s birthday party = 5
Number of friends from his summer camp = Number of classmates came to Dan’s birthday party = 5
Number of relatives in Dan's party =
Let x be the number of relatives, then,

Total number of guest in Dan's party =

Hence, there were 25 guest in Dan's party.