Answer:
Answer choice A, I believe
Step-by-step explanation:
 
        
             
        
        
        
Given parameters: 
Fraction given to charity = 
Fraction given to wife = 
Unknown: 
Fraction given to son and daughter =?
Solution: 
Let the total property  = x 
     Fraction given to charity  = 
     Fraction given to wife  =  
 
 The remaining was given to son and daughter = F
     So; 
      Total property  = fraction given to charity + fraction given to wife + fraction given to son and daughter
          x  = 
             F = x - ( )
)
             F = 0
The son and daughter will not inherit anything
 
        
             
        
        
        
If the answer is an equation then it is:
x=(4y+15)/(5-3y)