Question

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. 0.018 millimeters
B. 0.009 millimeters
C. 0.18 millimeters
D. 0.09 millimeters

Answer 1

Required layer of coating = 0.03
layer of coating done ---------=0.021
you have to subtract. so you put 1 zero on 0.03 so it will become 0.030 then subtract
0.030 – 0.021 = 0.009

Answer 2

0.030 - 0.021 = 0.009***

Answer 3

thanks i was thinking 0.09 but ok thanks @nathan917

Answer 4

Anytime.

Answer 5

:)