Heres an algebraic riddle that I can't solve! HELP!?

tjflorida711

New member
Jul 22, 2008
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A brick wall has a bottom row 49 bricks long, each row up has two less bricks then the one below it. The top row has 3 bricks. The wall is one brick thick....So its like a triangle.

I thought I could solve it using geometry taking 49 x 24x 1/2 but for some reason it didn't work. How do you solve this algebraically?
 
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