Q:
      
      
         
            
Solve The Logical Number Puzzle?

         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: D) 90         
         
Explanation: The logic in the given puzzle is 
4 + 4 = 4 * 4+1 = 4 * 5 = 20
5 + 5 = 5 * 5+1 = 5 * 6 = 30
6 + 6 = 6 * 6+1 = 6 * 7 = 42
7 + 7 = 7 * 7+1 = 7 * 8 = 56
Similarly
9 + 9 = 9 * 9+1 = 9 * 10 = 90.
       
      
      
      
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