basic word problem

Question

Leila received a
$90
gift card for a coffee store. She used it in buying some coffee that cost
$8.12
per pound. After buying the coffee, she had
$49.40
left on her card. How many pounds of coffee did she buy?

Answer 1

Let x = number of pounds of coffee purchased.

 

Leila spend on coffee x•8.12 and have left 49.40.

 

The equation is

90 - x•8.12 =49.40

 

We solve for x the above equation.

x•8.12 = 90 -49.40

x•8.12 = 40.60.

x = 40.60/8/12

x = 5.

Laila bought 5 pounds of coffee.