the value of each column,row and diagonal is the sam .what is the value of A

  7 12
  10  
8 A  

 

  
   
   

 

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1 Answer

The common total is given by the diagonal 8+10+12=30. Call the top left-hand corner number B, then B+7+12=30 so B=11. Call the bottom right-hand corner E, then B+10+E=30, and E=30-10-B=20-B=20-11=9. The bottom row 8+A+E=30, making A=22-E=13.

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