SOLUTION: A music store is selling compact discs for $11.50 and $7.50. You buy 12 discs and spend a total of $106. How many CD's that cost $11.50 did you buy?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A music store is selling compact discs for $11.50 and $7.50. You buy 12 discs and spend a total of $106. How many CD's that cost $11.50 did you buy?      Log On


   

Question 393812: A music store is selling compact discs for $11.50 and $7.50. You buy 12 discs and spend a total of $106. How many CD's that cost $11.50 did you buy?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

buy 12 discs

Let x and (12-x)represent the number of disk costing 11.50 and 7.50 respectively

Question states***

 11.50x + 7.50(12-x) = $106

             4x = $106 - 7.50*12

             4x = $106 - 90

             4x = 16

              x = 4, the number of disk costing 11.50



CHECKING our Answer

  4*$11.50 + 8*$7.50 = $106