Ashley got a prepaid debit card with 15 on it. For her first purchase with the card, she bought some bulk ribbon at a craft store. The price of the ribbon was 24 cents per yard. If after that purchase there was 6.60 left on the card, how many yards of ribbon did Ashley buy?
Let x be the number of yards of ribbon Ashley bought.
The total cost of the ribbon is 0.24 * x.
After the purchase, Ashley had 15 - 0.24 * x = 6.60 left on the card.
Solving for x:
0.24x = 15 - 6.60
0.24x = 8.40
x = 8.40 / 0.24
x = 35
Ashley bought 35 yards of ribbon.