Answer;
Sean got 24 points
Katie got 31 points
Kevin got 8 points
Emily got 12 points
Sorry I cannot give proper explanation because of typo issues.
Hope that can help.
It is best to use mental math with some equations (5x5 or something that is easy enough that work does not have to be shown 10 dived by 5
The answer to your question is -4
If

is left, that means

was spent. So

of the total amount is equal to 39.. Let's say x to the total amount.