Which situation would require determining volume?

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

If 25% of y is 30, what is 60% of y?

What is the value of the expression below? 148+(-6)| + |– 35= 7|