Coke : sprite 
  4     :   5
 (x5)     (x5)
  20   :  25
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Answer: There are 25 cans of sprite.
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Since the length is 15, and the width would be 15, you need to first do 15 x 15. 
15 x 15 = 225
Multiply the 6 faces.
225x6
Your final answer would be 1,350.
        
             
        
        
        
you find what they both divide by and then divide each one and then you keep doing that until you cant no more