Answer:
Well, it's the perimeter, so...40.
You just calculate the perimeter of a rectangle with the lenght of 12 and width of 8, by the formula

or you can factor it out.
Probability of an egg coming out of the boiling process with a cracked shell:

x is equal to 0 because 6 is already equal to 6
so there shouldnt be another number unless its 0
0+6=6