The school band is comprised of middle school students and high school students, but it always has the same maximum capacity. Last year the ratio of the number of middle school students to the number of high school
students was : . However, this year the ratio of the number of middle school students to the number of high
school students changed to : . If there are middle school students in the band this year, how many fewer high
school students are in the band this year compared to last year? Explain.