Question 1205309
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You are not reading the given information correctly.<br>
There are 5 stacks of bricks.  Each stack consists of bricks stacked in piles 9 bricks wide, 9 bricks high, and 4 bricks deep.  The total number of bricks is 5*9*9*4 = 1620.  The number of bricks used is 1620-12 = 1608.<br>
Presumably the bricks are rectangular; otherwise they aren't going to make a good path.<br>
But knowing only the area covered by each brick, we can only determine the total area covered by the 1608 bricks; we can't determine the length of the path without more information.<br>
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To the student....<br>
You need to re-post the question with all the needed information.  Sending me the missing information in a thank-you note won't get your question answered.<br>