80$ because 50 divided by 3 is 16.67 and 80 divided by 5 is 16 so yeah $80
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
3/12 really is 1/4  (Divide top and bottom by 3) 3/3 = 1 and 12/3 = 4
1/5 + 1/4 = 4/20 + 5/20 = 9/20
There is something we don't know about this question. If you put a remark, I will come back and look at it.
 
        
             
        
        
        
I thought it was -4 I calculated it and that’s what I got?¿
        
             
        
        
        
The answer that you are looking for is C.
        
             
        
        
        
In standard form its written 
3x-12=-9
if you need help solving then here you go as well
3x-12=-9
add 12 to both sides
3x=3
divide both sides by 3 
x=1