Chocolates costing $8 per pound are to be mixed with chocolates costing $3 per pound to make a 20 lbs mixture. If the mixture is to sell for $5 per pound, how many pounds of each chocolate should be used? Which of the following equations could be used to solve the problem?

8x + 3(20) = 5(x + 20)
8x + 3(20 - x) = 5(20)
8x + 3x = 5(20)

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.