Question

Linda received a $90 gift card for a coffee store. She used it in buying some coffee that cost $7.81 per pound. After buying the coffee, she had $58.76 left onher card. How many pounds of coffee did she buy?

Answer 1

You know that 1 pound of coffe costs $7.81

Also the gift card had an initial amount of $90 and there where $58.76 left after her coffee purchase.

1 step: calculate how much she spent by subtracting the final amount to the initial one:

$90-$58.76= $31.24

2 step: using the price per pound calculate how many pounds she bought. You can use cross multiplication for this step:

$7.81_____1pound coffee

$31.24____xpounds coffee

`x=(31.24\cdot1)/(7.81)=4`

Linda bought 4 pounds of coffee.