20:12
i think. 20 being the number of total students to 12 which is the number of boys
 
        
             
        
        
        
The answer is C. L x W x H.
Hope this helps!
        
             
        
        
        
Step-by-step explanation:
Rs 720 
Cost of 1 m of cloth = 450/5= Rs 90
Cost of 8 m of cloth= 90*80= Rs 720
 
        
                    
             
        
        
        
Given:
Four equations in the options.
To find:
The equation which represents a proportional relationship.
Solution:
If y is proportional to x, then


where, k is the constant of proportionality.
In this case if x=0, then y=0. It means the graph of a proportional relationship passes through the origin.
From the given options, only option B, i.e.,  , is of the
, is of the  , where,
, where,  .
.
So, the equation  represents a proportional relationship.
 represents a proportional relationship.
Therefore, the correct option is B.