Susan received a $70 gift card for a coffee store. she used it in buying some coffee that cost $7.23 per pound. after buying the coffee, she had $48.31 left on her card. how many pounds of coffee did she buy

Amount spent on coffee=   $70 - $48.31 = $21.69 

Coffee cost $7.23 per pound

No of pounds of coffee bought =    Amount in $ / Cost in $ per pound
                                         
                                                 = 21.69 / 7.23
                              
                                                  = 3

3 pounds of coffee was bought

Dwould be the answer