Devide 1 cup by 3 and you get 1/3 of a cup. Then devide 3/4 of a cup by 3 and you get 1/4 of a cup. Then you have to give them a common denominator. 1/3 can be multiplied by 4 and it becomes 4/12, and it still holds the same value. 1/4 can be multiplied by 3 and it becomes 3/12, and it also holds the same value as before. Add the two fractions and you get 7/12. 3/12 plus 4/12 equals 7/12. Your answer is 7/12 of a cup.