tính thể tích và diện tích mặt hình nón cụt được tạo thành bằng cách quay hình thang vuông OABC với O(0,0), A(0,1),B(3,2),C(3,0) quanh trục ox

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?