Posted by alisha on Thursday, September 23, 2010 at 7:39am.
John and Paul work together at a music store. In one afternoon, they sold a total of 41
CDs. If Paul sold 9 more CDs than John, how many CDs did John sell?

math  MathMate, Thursday, September 23, 2010 at 7:53am
Math:
If we take away 9 CDs, then they sold equal quantities, namely (419)/2=16 each.
So John sold 16, and Paul sold 16+9=25 CDs.
Algebra:
Let x=number of CD's sold by John, then Paul sold x+9.
Equate total:
x+x+9=41
2x=419
2x=32
x=16 (John)
x+9=25 (Paul) 
math  alisha, Thursday, September 23, 2010 at 8:04pm
thank you