Answer: $7.75
Explanation:
Given : Kelly and 23 friends go roller skating they pay a total for $186 .
i.e. Total cost for skating = $186
Total persons = 1+23=24 (Including Kelly)
Now, to find the cost for one person to skate, divide the total cost by total persons, we get

Hence, it costs $7.75 for one person to skate.