Carter asks 40 of his friends what their favorite type of music is. He records the data in a circle graph to display the results. Carter compares the data for each person he interviewed. Which two types of music account for three-fifths of the people interviewed? A) Alternative & Jazz
B) Rock & Hip Hop
C) Rock & Alternative
D) Rock & Jazz
E) Alternative & Hip Hop

(This is the hint my teacher gave me, but I still don't understand :/ "So you need to figure out what is three-fifths of 100. If you multiply both the numerator and denominator by 20 (because 20 x 5 = 100) you can find that percentage of people.
3 60
__ = ___
5 100
So which two types of music add to be 60% of the entire circle?")