SOLUTION: Jennifer purchased CDS. Some CDS were from a bin marked "2 for $12" and others were priced at $17. If the total for 11 CDs cost $143, how many CDS were from the "2 for $12" bin?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Jennifer purchased CDS. Some CDS were from a bin marked "2 for $12" and others were priced at $17. If the total for 11 CDs cost $143, how many CDS were from the "2 for $12" bin?       Log On


   

Question 1009933: Jennifer purchased CDS. Some CDS were from a bin marked "2 for $12" and others were priced at $17. If the total for 11 CDs cost $143, how many CDS were from the "2 for $12" bin?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Jennifer purchased CDS. Some CDS were from a bin marked "2 for $12" and others were priced at $17. If the total for 11 CDs cost $143, how many CDS were from the "2 for $12" bin?
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t + n = 11 CD's
6t + 17n = 143 dollars
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Modify for elimination:
6t + 6n = 6*11
6t + 17n = 143
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Subtract and solve for "n"::
11n = 77
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n = 7 (# of singles)
t = 11-n = 4 (# of 2fers)
Cheers,
Stan H.
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