Well, if he has two bags with 6 tiles each, you need to add up the number of tiles he has in total, so 6+6=12, which will be your denominator. Then to find the numerator, you have to think about how many even tiles that he has in total. 2, 4, and 6 are even numbered and he has two sets of each of those. So using that, what do you think the answer is? ^.^