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April 17, 2015

Posted by **Liam** on Tuesday, November 17, 2009 at 9:52am.

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 compact discs that cost $11.50 did you buy?

- Math -
**drwls**, Tuesday, November 17, 2009 at 10:03amAre you learning algebra? Both of these questions are of the same type: two equations in two unknowns.

In the first problem, let S be the number of student tickets and G be the number of General Admisison tickets.

S = 450 - G

4(450-G) + 6G = 2340

2G = 2340 - 1800 = 540

G = 270

S = 450 - G = 180

Do the other one the same way.

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