Ok so you would just take the two fractions and simply if needed and that the answer!
 
        
                    
             
        
        
        
Answer:
50kg
Step-by-step explanation:
K = Keith  B = Beth  H = Henry
K = 20 + B
H = 2B - 30
K = H
20 + B = 2B - 30
B = 50kg
 
        
                    
             
        
        
        
Hello from MrBillDoesMath!
Answer:
Top line: y = (2/3)x + 2
Bottom line:  y = (2/3)x  -1
Discussion:
The graph provided is hard to read but I did the best I could.
The top line appears to pass through the points (0,2) and (-3,0)
For this line
m =  change y /change x = (0-2)/(-3-0) = -2/-3 = +2/3. So
y = mx + b => y = (2/3) x+ b.  As the line passes through (0,2) set x = 0, y= 2 in y = (2/3)x + b =>  
2 = (2/3) 0 + b   => b = 2
Therefore    y = (2/3)x + 2
The bottom line appears to pass through the points (0,-1) and (3,1)
For this line
m =  change y /change x = (1-(-1)) /(3-0) = +2/-3. So
y = mx + b => y = (2/3) x+ b.  As the line passes through (0,-1) set x = 0, y= -1  in y = (2/3)x + b =>  
-1  = (2/3) 0 + b   => b = -1
Therefore    y = (2/3)x + -1
Thank you,
MrB
 
        
             
        
        
        
2115000
x*10= 42300
x= 4230
x*500
4230*500= 2115000
Hope this helps
        
                    
             
        
        
        
Formula: l•w•h
Answer: 330 yd
Hope that helps :)