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To find the scale, we need to determine the ratio between the length of the picnic area in real life and the length of the drawing.
First, we need to convert the lengths to the same units. Since yard is longer than inch, we need to convert the length of the picnic area in yards to inches.
1 yard is equal to 36 inches. So, 135 yards = 135 * 36 inches = 4860 inches.
Therefore, the scale is:
4860 inches (real life) / 15 inches (drawing) = 324
So, the scale Rita used for the drawing is 1 inch on the drawing represents 324 inches in real life.