Problema Solution
A used book store started selling used CDs and videos. They sold a combination of 40 CDs and videos in the first week. They charged $4 per CD and $6 per video and total sales were $180. Determine total number of CDs and videos sold.
Answer provided by our tutors
Let
x = the number of CDs sold
y = the number of videos sold
Now we can write the following system of equations:
x + y = 40
4x + 6y = 180
........
Click here to see the step by step solution for the system of equations
........
x = 30 CDs
y = 10 videos
There were 30 CDs and 10 videos sold.