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13 feet
First add the extra 4 meters to both the length and width of the rectangular pool. So now you have an area 7 meters by 9 meters (don't forget the walk is surrounding the pool; not just on two sides). Calculate the area which is 63 meters squared = 9 * 7. Since you only want the are of the walk, just subtract the area of the rectangular pool by itself without the brick walk added, 3 * 5 = 15 meters squared. Now just subtract the area of the pool plus the brick walk and the area of the pool itself, 63 - 15 = 48 meters squared. Which is your answer.
11250 square feet
15x9=135
135