Question

A thin layer of paint is 7x10^-7 m thick. In​ contrast, a coin is 3.43 x 10^-3 m thick. How many layers of paint are in a stack that is the height of the​ coin?

Answer 1

There's 4 layers of paint cause you should just add 4 to 3.43 and you get 7.43 x 10^-7..?