Answer:
5 pounds / Make sure to read the explanation so you know how to solve it
Explanation:
First thing to do is:
Subtract 90 by 47.10 to find the amount of money she spent
![90 - 47.10 = 42.90](https://img.qammunity.org/2022/formulas/mathematics/high-school/k2yvqzsmv6zr0sn0o4lj6hy1m63g2t0cd7.png)
She spent $42.90 on coffee and we know that it costs $8.58 per pound so that means that we should divide 42.90 by the cost per pound:
![42.90 / 8.58 = 5](https://img.qammunity.org/2022/formulas/mathematics/high-school/wcm05p4ipaiw8n1jp4092hjto1x3xgmnxl.png)
She bought 5 pounds of coffee
Hope I helped :]