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16 July, 09:03

Boris has 20 Cd's in his music collection. Given that 20% of the CD's are rock music and 60% of them are pop music. How many CD's are other types of music.

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  1. 16 July, 11:51
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    The total amount of CD's are 100% so 100 - (20+60) = 20% - > the percentage of the other types of music. Then multiply 20% by 20 to get 4. So there are 4 CD's that are other types of music
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