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14 September, 16:19

Holly had a gift card with a $365 balance. She bought several cds that cost $18 each. After the purchase, her gift card balance was 185 which equation can be used to determine the number of CDs a she purchased.

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  1. 14 September, 17:00
    0
    The number of CDs that she purchased is 10

    Step-by-step explanation:

    Let x represent the number of CDs that she purchased.

    Holly had a gift card with a $365 balance. She bought several cds that cost $18 each. This means that the cost of x CDs would be 18*x = $18x.

    After the purchase, her gift card balance was 185

    This means that

    365 - 18x = 185

    Subtracting 365 from the left hand side and right hand side of the equation, it becomes

    - 18x + 365 - 365 = 185 - 365

    - 18x = - 180

    18x = 180

    x = 180/18

    x = 10
  2. 14 September, 19:01
    0
    10 CDs

    Step-by-step explanation:

    First, we need to find out how much she spent in total.

    365 - 185 = 180

    Okay, we now know that Holly spent 180 off of her gift card in total. Now we need to find out how many CDs she purchased by spending that amount of money.

    180 : 18 = 10

    Let's check our math.

    18 * 10 = 180

    So our answer is Holly bought 10 CDs.
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