



 
Juan, If you add the numbers from left to right the way we read it then you have 2 + 4 = 6. Next you have 6 + 6 to get 12. What the question is suggesting is that if you look at the three numbers and realize that 4 + 6 = 10 then the second step is easier, 2 + 10 = 12. What I did was group the 4 and 6 together first. Using mathematical notation
I hope this helps,  


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