I have unknown numbers of matchboxes and matchsticks.
Find the sum of the number of matchboxes and the number of matchsticks that I have.
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Let b be the number of match boxes that I have and s be the number of match sticks that I have. Then
b − 2 s = 1 2 + b − 2 2 ( 1 )
b s = 7 + b 8 ( 2 )
Solving the system of equations gives b = 6 and s = 5 0 . The desired answer is 6 + 5 0 = 5 6 .