A used book store also started selling used CDs and videos. In the first week, the store sold a comb

Discussion in 'Calculator Requests' started by math_celebrity, Feb 14, 2021.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    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.

    Let the number of cd's be c and number of videos be v. We're given two equations:
    1. c + v = 40
    2. 4c + 6v = 180
    We can solve this system of equations using 3 methods:

    No matter which method we choose, we get the same answer:
    c = 30
    v = 10
     

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