In order from smallest to largest the answer is : 1.3, 1.9, 5.5, 9.6, 12.1, 15.5, 16.5, 16.8, 20.2
        
                    
             
        
        
        
You'll want to make a common denominator with 6 and 8. 
That denominator would be 24. 
24/6=4 so you would have to multiply 5/6 by 4/4 to get 20/24. 
Next, 24/8=3 so 1/8 could be multiplied by 3/3 to get 3/24. 
Since 3 is less than 20, 1/8 is smaller than 5/6.
 If you want the same numerator, 5/8 = 15/24. This would make 5/8 smaller than 5/6 as well. 
The highest eighth you can go is 6/8 which is 18/24. 
So you can use any numerator between 1 and 6 with a denominator of 8 to get a fraction smaller than 5/6.
        
             
        
        
        
Y/(X•grams), find the total cost of the gold, then use y to divide the whole thing.