The number of tiles to be ordered is 20 tiles
Let the Amount previously in stock = 160 tiles
Amount stock sold = 150 tiles
Minimum stock that should be kept in stock = 30 tiles
The number of tiles left after selling 150 :
Previous stock - amount sold
Stock left = (160 - 150) = 10 tiles
Order required to reach minimum stock count :
Minimum stock - Stock left
(30 - 10) = 20 tiles
Therefore, the Number of tiles that needs to be ordered is 20 tiles.
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