I have three problems and I really dnt want to post those problems back to back. Any help will be grateful.

Any help will be grateful. Thank you very much.

- The length of a rectangular plot of land is 4 times the width. If the perimeter is 2,000 feet, find the dimensions of the plot.
- The plans for a rectangular deck call for the width to be 10 feet less than the length. Sam wants the deck to have an overall perimeter of 64 feet. What should the length of the deck be?
- Sarah and Michelle have 20 feet of shelf space in their dorm room. Sarah has tons of stuff, and insists that she needs twice as much shelf space as Michelle. If she gets her wish, how much shelf space will Michelle be stuck with?