A school conducted a survey among its students to determine their favorite subjects. The results are represented in the following bar graph:
Mathematics: 30 students
Science: 45 students
History: 25 students
Art: 20 students
Based on this data, determine whether Quantity A and Quantity B are related as described below:
Quantity A: Number of students who prefer Science
Quantity B: Total number of students who prefer subjects other than Science