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September 30, 2014

September 30, 2014

Posted by **jazmyn** on Sunday, October 30, 2011 at 7:33pm.

- math -
**Millie**, Sunday, October 30, 2011 at 7:54pmold cds = x

new cds = 2.5x

4old cds + 9 new cds = 159

4(x) + 9(2.5x)=159

4x+22.5x=159

26.5x=159

x=6 so old cds cost $6.

and new cds cost 2.5(6)=$15.

Check:

4(6)+9(15)=159

24+ 135 =159

159=159

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