



 
Hello Ann. In the first scenario, there are r rows and r+8 tiles per row, so there are r(r+8) tiles in total. In the second scenario, there are r+3 rows and 16 tiles per row, so there are (r+3)16 tiles in total. These are equal, so r(r+8) = (r+3)16. Solve for r, then use that in either the left hand or right hand side above. Hope this helps,  


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