Question 958961
F=pounds of $40: 
$40F+$80(20lbs)=$50(20lbs+F)
$40F+$1600=$1000+$50F Subtract $40F from each side.
$1600=$1000+$10F Subtract $1000 from each side.
$600=$10F Divide each side by $10
60=F ANSWER: She needs 60 pounds of the $40 coffee.