In a shipment of CD's to a music store, 5/8 of the CD's are pop and 1/4 of the CD's are country music. If there are 72 CD's in the shipment, how many CD's are either pop or country music?

1/4 multiplied by 72 is 18. 5/8 multiplied by 72 is 54. There are 18 pop music CD's in the shipment and 54 country music CD's in the shipment.

By taking 72 multiplied by 5/8 will give you 45 pop cd's

By taking 72 multiplied by 1/4 will give you 18 country cd's

45 added to 18 will give you a total of 63 total CD's minus the 72 leave you with 9 CD's left over.