Adam noticed that if he takes the opposite of his age and adds 49 he gets the number 28 how old is Adam

The way to find the answer is quite simple. You use inverse opperations. The inverse of addition is subtraction. So, we take 28 - 49, which equals - 21. It also says that the answer is the opposite. So, the opposite of - 21 is 21. So therefore the answer is 21.