The value of the missing number is 7.
What is the missing number?
Here we want to solve the following equation:
28/64 = x/16
We want to find the value of x, to do so, we can just isolate it in the right side of the equation. To do that we can multiply both sides by 16, we will get:
16*(28/64) = x
7 = x
So the correct option is B.