Am bc it is a example as a gh
        
             
        
        
        
Can you explain what the question is asking?
        
             
        
        
        
Answer:
The answer is 8.5 hope this helped.
 
        
             
        
        
        
To solve this you can make a perportion
252     x 
----- = -----
350     100
and solve 252 times 100/350=72
252 is 72% of 350
        
             
        
        
        
There is no b unfortunately
Find inverse of x+a
interchAnge
Inverse is
Now
- x-a=cx-d
- x-cx=a-d
- x(1-c)=a-d
- x=a-d/1-c
So
You can have any number according to this but
- c must not be 1
- a and d must not be equal .
- All three should belongs to integers set
Note:-
As there is no b given in question (May be missed in typing) Part-2 's equation can't be executed and part 3 also