A...........................
The perimeter of the sandwich is the sum of all its sides, then we have:

Therefore the perimeter is:

The length of the crust is the same as the perimeter of the sandwich; if x=1.2 we have that:

Therefore the length of the crust is 45.52
Attached the solution and work.
Answer:
Julio's number is 34.
Step-by-step explanation:
34-14=20×-3=-60