Please try to follow me, as I demonstrate a method of solution.  
This could get complicated.  I'll try to go slowly, and you must 
stop me if I do anything that's not clear.
Ready ?
You said that                    -5c/8  =    20
Multiply each side by  8:  -5c     =  160
Divide each side by  5 :   - c      =    32
Multiply each side by -1 :   c      =  -32  
        
             
        
        
        
Answer:

Step-by-step explanation:


 
        
                    
             
        
        
        
It doesn’t include the number it just stops there
        
             
        
        
        
Answer:
6 years 
Step-by-step explanation:
1.75% of 1,200 = 21
 so 1 year= 21 
 21+21= 42         2 years
42+21=63           3 years
63+21=84            4 years
81+21=105             5 years
105+21=126            6 years 
 Or you can do 
21x6=126 so it has to equal 6 years
 
        
             
        
        
        
Answer:
G represents sets of student appearing for GENERAL KNOWLEDGE  
M represents sets of student appearing for MATHS
S represents sets of student appearing for SCIENCE
G ∩ M = { Max, Anael}
G ∪ S = { Max, Acel, Carl, Anael, Acton, Dario, Kai, Barek, Carlin}