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To find the area of the scale drawing, we first need to find the scale factor.
Scale factor = Actual base length / Scale base length
Scale factor = 25 inches / 10 inches
Scale factor = 2.5
Now, we can find the actual height of the flag in the scale drawing:
Scale height = Actual height / Scale factor
Scale height = 15 inches / 2.5
Scale height = 6 inches
Now, we can find the area of the scale drawing:
Scale area = (1/2) * base length * height
Scale area = (1/2) * 10 inches * 6 inches
Scale area = 30 square inches
Therefore, the area of Magnolia's scale drawing is 30 square inches.