= 20  
= ?  
= ?  
= 21  
= 23  = 8  = ?  = ? 
Each traffic sign stands for a number. Some of the sums of rows or columns are shown. What numbers might the signs stand for?
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Topics: Starter  Algebra  Logic  Problem Solving  Puzzles  Simultaneous Equations
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= 2  = 10  
= 8  = 3 
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The answer to this puzzle is not 12. What is it?