Pam and Erin are both planting gardens for their backyards. They want their gardens to be proportional. If Pam's garden has a length of 16 feet and a width of 12 feet, what length does Erin need if the width of her garden is 21 feet? Explain how you determined your answer.

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.