Question

Christine received a $90 gift card for a coffee store. She used it in buying some coffee that cost $8.27 per pound. After buying the coffee, she had $56.92 left on her card. How many pounds of coffee did she buy?

Answer 1

Since Christine received a $90 gift and after buying the coffee, she had $56.92 left, she spent on coffee:

90-56.92=33.08

So, to know how many pounds she bought, we can use the expression:

$\begin{gathered} 8.27\cdot x=33.08 \\ x=\frac{33.08}{8.27} \\ x=4 \end{gathered}$

She bought 4 pounds of coffee.