Answer:
5x + 7x + x = total number of songs
Step-by-step explanation:
x represents the number of pop tracks
since there are 5 times as many classical as there are pop then classical can be represented by 5x
since there are 7 times as many rap as there are pop then rap can be represented by 7x
when adding all these together you will find the total number of songs on the MP3
