Hi

Let x represent how the block weighed to begin with

Question states***

 x - x/3 - (1/3)(x/3) = 40lb    |loses one third of its weight every hour

Solving for x

 x - x/3 - x/9 = 40

 9x - 3x - x = 360

       5x = 360

        x = 72lbs, original weight of the block



CHECKING our Answer***

   72lb - 24lb - 8lb = 40lbs 

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