Answe
15 inches : 7 feet.
Step-by-step explanation
The actual gym width = 63 feet
The gym width in the drawing = 135 inches
The required scale is 135 inches : 63 feet.
Divide all through by 9
135/9 : 63/9 = 15 inches : 7 feet.
Therefore, the scale Bobby use for the drawing is 15 inches : 7 feet.