Teresa received a 80 gift card for a coffee store. She used it in buying some coffee that cost 7.88 per pound. After buying the coffee, she had 32.72 left on her card. How many pounds of coffee did she buy?
Let x be the number of pounds of coffee Teresa bought.
The total cost of the coffee is given by 7.88x.
After buying the coffee, Teresa had 80 - 7.88x = 32.72 left on her card.
Solving for x:
80 - 7.88x = 32.72
7.88x = 47.28
x = 47.28 / 7.88
x = 6
Teresa bought 6 pounds of coffee.