To find the length of the room in Kenneth's drawing, you use the scale provided, which is 1 inch = 4 feet.
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First, determine how many feet are represented by one inch in the drawing. The scale states that 1 inch corresponds to 4 feet.
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To convert the actual length of the room (20 feet) into inches on the drawing, use the scale: \[ \text{Length in inches} = \frac{\text{Actual length in feet}}{\text{Feet per inch}} = \frac{20 \text{ feet}}{4 \text{ feet/inch}} = 5 \text{ inches} \]
Thus, the length of the room in the drawing is 5 inches.