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11.John gives 1/2 of his apples to his mother, 1/3 to his sister, and 1/9 to his friend, leaving him with one apple. How many apples did John originally have?
12.The length of a rectangular playground is twice its width. If the length decreases by 2, and the width increases by 3, rectangular playground becomes a square playground. What is the perimeter of the rectangular playground?