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Posted by **alisha** on Thursday, September 23, 2010 at 7:39am.

CDs. If Paul sold 9 more CDs than John, how many CDs did John sell?

- math -
**MathMate**, Thursday, September 23, 2010 at 7:53amMath:

If we take away 9 CDs, then they sold equal quantities, namely (41-9)/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=41-9

2x=32

x=16 (John)

x+9=25 (Paul)

- math -
**alisha**, Thursday, September 23, 2010 at 8:04pmthank you

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