Answer:
see explanation
Step-by-step explanation:
Using cross- products, that is
 =
 =  then ad = bc
 then ad = bc
Given the ratios
 and
 and 
Then equating and using cross- products
If both sides equate then the ratios are equivalent
 =
 =  , then
, then
4 × 21 = 6 × 14 ⇒ 84 = 84
Both sides are equal thus the ratios are equivalent
 
        
             
        
        
        
I think the answer is 3/5
        
             
        
        
        
1/3 cup per servings mean 3 servings per cup
3 servings x 2 cups= 6 servings total 
        
                    
             
        
        
        
An equivalent ratio of 64:60 is 16:15.