Question

question 20 of 20: select the best answer for the question. 20. 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? a. 0.18 millimeters b. 0.009 millimeters c. 0.018 millimeters d. 0.09 millimeters mark for review (will be highlighted on the review page)

Explanation:

Step1: Identify the required thickness and the existing thickness

Required thickness = 0.03 millimeters, Existing thickness = 0.021 millimeters

Step2: Calculate the additional thickness

Additional thickness = Required thickness - Existing thickness = 0.03 - 0.021 = 0.009 millimeters

Answer:

B. 0.009 millimeters