Quote Originally Posted by jnanian View Post
the way it was worded was difficult to understand
but the end answer isn't very difficult to figure out ... i think ?
Yeah the answer isn't tough.

What we understand is that the difference between f2.8 and f16 is 5, not 13.2. The first question is asking us to write the equation that gets us 5 when we look for the difference between 16 and 2.8; and show that 4 is the difference between 1/50 & 1/800.