Question 388695
Let m,d, r, s the amount in $ that Mike, Debra, Ron and Susie get : then 

m + r = 27 $
m + d = 25 $
m + s = 23 $
m + r + d + s = 47 $

The sum of the 3 1st equation give : 

3m + r + d + s = 75 $ | from which we subtract equation 4 : 

2m = 18$, hence Mike gets 9$

Ron receives 18$

Debra 16$

Susie 14$
 
The sum is : ($)9+18+16+4=20 + 18 + 9 = 38+9 = 47$