Question: 13) A used book store also started selling used CDs and videos. In the first week, the store sold a combination of 40 CDs and

13) A used book store also started selling used CDs and videos. In the first week, the store sold a combination of 40 CDs and videos. They charged $4 per CD and $6 per video and the total sales were $180. Determine the total number of CDs and videos sold. Solve by either elimination or substitution

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