Answer: 
m = 1
Step-by-step explanation:
11m + 13 = m + 23
<u>Get m by itself by subtracting m from both sides. </u>
10m + 13 = 23
<u>Subtract 13 from both sides.</u>
10m = 10
<u>DIvide by 10.</u>
m = 1
 
        
                    
             
        
        
        
Dude stop commenting that people need real answer not a link
        
             
        
        
        
I wrote my decision on a piece of paper.
 
        
             
        
        
        
First we subtract it:
18 - 15 = 3
Now we divide it to the original:
3 / 15 = 0.2
Multiply by 100:
0.2 * 100 = 20%
        
                    
             
        
        
        
3, 9 can fit into 27 3 times