You multiply by 4
All you really have to do is try the answers with 2 numbers. For example, 4 and 16. If you add 12 to 4 and you should get 16, now try it to 16 and 64, adding 12 to 16 gives you 28, which is not what you’re looking for. You can try this method for all the answers u til you get the right one.