The teacher is 48 years old. You can tell that the key means that add the 2 and the 4 together to get the answer. For the 2, add 4,6,8,8 and go the 4 you have to add the 0,0,7,7,8 and then you get 26 and 22. Lastly, add them together and then you would get the answer ‘48’.
The best way to ensure parallel construction in your essay is to use similar "<span>A. sentence structure throughout the essay".This allows the reader to feel as though they are reading something that is tied together in a meaningful way.</span>