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Rita used a scale of 1 inch : 9 yards for the drawing.
To find this scale, we can set up a proportion:
1 inch / 15 inches = x yards / 135 yards
Cross multiplying, we get:
15x = 135
Dividing by 15 on both sides, we get:
x = 9
Therefore, the scale is 1 inch : 9 yards.