The layer of gold coating on a ring should be 0.03 millimeters thick when the ring is completed. A coating of 0.021 millimeters has already been applied. How many more millimeters of gold coating must be added to finish the ring?



Answer :

0.03-0.021 = 0.009mm more coating needed

0.009millimeters is correct answer


Step-by-step explanation:


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