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.

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

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.