Solve the compound inquality

Need on this one asap im almost done with this subject

When a rectangle is dilated, how do the perimeter and area of the rectangle change?

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 ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.