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Edge length of table,a = 20 in
Area of side of table = a^2 = 20^2 = 400 in^2
Edge length of tile,a = 5 in
Area of tile = a^2 = 5^2 = 25 in^2
Number of tiles needed on one side
= Area of side of table / Area of tile
Number of tiles needed for top and 4 sides of the table
= (1 + 4)*16
= 80 tiles
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