Home > ACC7 > Chapter cc29 > Lesson cc29.1.1 > Problem9-15

9-15.

Jack has 120 songs on his music player. Some are rock, some are jazz, and the rest are classical pieces. If his music player is on random shuffle mode, the probability that it will play a classical piece is and the probability that it will play a jazz piece is . How many songs of each type are on Jack’s music player? Homework Help ✎

If the probability of playing a classical piece is two fifths, that means that two fifths of the songs on Jack's music player are classical.
Can you create and solve a proportion to find out how many songs out of 120 are classical.

$\text{Your proportion might look something like this }\frac{2}{5}=\frac{x}{120}.\text{ Can you solve this proportion?}$

Jack has 48 classical songs on his music player. Can you find the number of jazz and rock songs on his music player?

After you use a proportion to find how many jazz pieces Jack has, subtract the sum of classical and jazz songs from the total of 120 to find the number of rock songs on his music player.