I think the answer is 31.2 miles per gallon
China plate is 12 years (16-4) and Glass plate is 4 years (12÷3)
The possible values for | x-y | > 0 is any number above 0. x must be greater than y. When | x-y | = 0, That means that x and y are equal to each other. | x-y | can not be less than 0, but it can equal 0.
Hope that this helped!
