In need of work as well as answers for the following word problems. Thanks so much!

1. Venus and Serena measured a tennis court and found that it was 42 feet longer than it was wide. it had a perimeter of 228 feet. What were the length and the width of the tennis court?

2. The length of a rectangle is 7 feet more than the width. If the length were decreased by 3 feet and the width were increased by 2 feet, the perimeter would be 32 feet. Find the length and width of the original rectangle.

3. The two biggest Fortune 500 companies in 2011 were Wal-Mart and Exxonmobil. Exxonmobil's revenue was $67 billion less than that of Wal-Mart. Total revenue for the two companies was $777 billion. What was the revenue for each company?

4. If a container of liquid contains 120 ounces of solution, what is the number of ounces of pure acid if the given solution contains the following acid concentrations?

(a) 0.5%

(b) 1%

(c) 1.25%

(d) 2.5%

5. How many liters each of 15% acid and 33% acid should be mixed to obtain 40 liters of 21% acid?

6. A truck radiator holds 18 liters of fluid. How much pure antifreeze must be added to a mixture that is 4% antifreeze in order to fill the radiator with a mixture that is 20% antifreeze?

7. Jose must invest a total of $15,000 in two accounts, one paying 4% simple annual interest, and the other paying 3%. If he wants to earn $550 annual interest, how much should he invest at each rate?

8. If the speed of a boat in still water is 10 mph, and the speed of the current of a river is x mph, what is the speed of the boat in each situation?

(a) going upstream (against the current)

(b) going downstream (with the current)

9. In his motorboat, Tran travels upstream at top speed to his favorite fishing spot, a distance of 36 miles, in 2 hours. Returning, he finds that the trip downstream, still at top speed, takes only 1.5 hours. Find the speed of Tran's boat and the speed of the current.