14/20=0.7 or 70% are soft-centred. If we take two candies we have three possibilities associated with probabilities:
Both soft-centred: 0.7²=0.49 or 49%
Both hard-centred: 0.3²=0.09 or 9%
One of each: 2×0.3×0.7=0.42 or 42%. 49+9+42=100%. So these are all the possible outcomes.
        
             
        
        
        
The first step you would take would be multiplying 5x2
        
                    
             
        
        
        
We need more information. You don't give us enough information....? Provide an image please. Or at least name the polynomials... 
 
        
             
        
        
        
23:8 is the simplest form. However, you can put 5.75:2 or even 2.86/1 if you are looking for the absolute simplest