How do I go about solving the problem below? Can any one help please?
In a group of 30 students, 25 are taking mathematics, 22 English, and 19 history. Every
student is taking at least one of the courses. The greatest number of students who COULD be
taking all three courses is x. The least number of students who COULD be taking all three
courses is y. What is the value of x + y?
a. 17
b. 19
c. 22
d. 23
e. 24
Thank you.