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20 February, 05:06

Caitlin has a $10 gift city certificate to the music store. She has chosen a n ember of CDs from the $7 bargain bin. If the cost of the CDs is $32 after the gift certificate is credited, how many CDs did she buy

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  1. 20 February, 06:38
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    She bought 4 Cds because if you know that 7+7=14 Then 14+14=28 then it only takes 4 more dollars to get to 32
  2. 20 February, 08:50
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    She bought 6 because 7n minus 10 equal 32, add 10 to both sides you get 7n=42 divide 7 and 42, n=6
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