The answer is

inches
Step 1. Subtract length of the door from the width of the door:

Step 2. You want the same space to be on each side of the bar. So, divide the difference from step 1 by 2:
Answer:
x.
Step-by-step explanation:
h(f(x) = x.
For example the inverse of f(x) = 2x is g(x) = x/2
f((gx)) 2 (x/2)
= 2x / 2
= x.
Ask SAPPHIREMOON, and they'll give you the answer, because I can't do math
Well first you would do 5 / 30 which makes 6 then you would 6 times 3 equals 18. So she would make 18 loaves of bread.