Question 1188672
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x black tiles and 2x white tiles.


Write the total area equation


    20x + 16*(2x) = 2704  cm^2

    20x + 32x     = 2704

       52x        = 2704

         x        = 2704/52 = 52.


<U>ANSWER</U>.  52 black rectangular tiles.
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Solved.