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’.
