Matthew gave equal numbers of crackers and cakes to his 3 friends. If he had 13 crackers and 45 cakes initially How many cakes did each person eat?
1. Matthew gave away all of his crackers, so he now has 0 crackers. 
2. Matthew gave away the same number of cakes as he gave crackers, so he now has 45-13=32 cakes. 
3. Since Matthew gave away the same number of crackers and cakes, and he gave away all of his crackers, each person must have gotten 1 cracker and 1 cake.