Answer:
4 Cd's are other types of music.
Step-by-step explanation:
Hello, I can help you with this,
Step 1
According to the question Boris has 20 CD's , it is our 100%
so.
20 CD ⇔100%
Also, 20% of the CDs are rock music and 60% of the CDs are pop music
20% rock music
60% pop music
x? other types
to find the percentage of other types of music do:
total collection-% rock music-% po music =% other type
100%-20%-60%=20%
so, the 20 % of the collection is of other type of music, let's find how many cds are using a rule of three.
Step 2
if
20 CD ⇔100%
x? ⇔20%
[tex]\frac{20}{100}=\frac{x}{20}\\ x=\frac{20*20}{100}\\ x=\frac{400}{100}\\ x=4[/tex]
so 4 Cd's are other types of music.
Have a good day.
