Step-by-step explanation:

 
        
             
        
        
        
The length could be 5 and width 3. That would equal 15
        
             
        
        
        
Step-by-step explanation:
Given,
y=2x=,z=3x,r=4x
Now,
x+y+z+r=360°(complete turn)
x+2x+3x+4x=360°(given)
10x=360°
x=360°/10
x=36°
Hence,
x=36°
y=2x=2×36°=72°
z=3x=3×36°=108°
r=4x=4×36°=144°
 
        
                    
             
        
        
        
First - 8
second - 4
third - 12
fourth - 9
        
             
        
        
        
45/26=1.7307692307692307692307692307692...
≈1.7308
100*1.7308=173.08
The unknown number is approximately 173.08.