Geometry

Question Analysis  
This problem examines understanding of how surface area scales with radius changes.  

Key Concept Explanation  
Critical concept:  
- Surface area scales with the square of the radius ratio .
- If radius doubles, surface area becomes times larger  

Step-by-Step Solution  
1. Find radius of Sphere X:  
   
   
    (r is non-negative)
2. Determine Sphere Y's radius:  
 

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