Sally made a scale drawing of a campsite. The tent, which is 6 feet wide in real life, is 10 inches wide in the drawing. What scale factor does the drawing use?

Simplify your answer and write it as a ratio, using a colon.

1 answer

To find the scale factor of the drawing, we compare the real-life size of the tent to its size in the drawing.

  1. Real-life width of the tent: 6 feet
  2. Drawing width of the tent: 10 inches

First, we need to convert the real-life width of the tent from feet to inches. Since 1 foot is equal to 12 inches:

\[ 6 \text{ feet} = 6 \times 12 = 72 \text{ inches} \]

Now we have:

  • Real-life width in inches: 72 inches
  • Drawing width: 10 inches

Next, we can find the scale factor by setting up the ratio of the drawing width to the real-life width:

\[ \text{Scale factor} = \frac{\text{Drawing width}}{\text{Real-life width}} = \frac{10 \text{ inches}}{72 \text{ inches}} \]

Next, we simplify this fraction:

\[ \frac{10}{72} = \frac{5}{36} \]

Now, we express the scale factor as a ratio using a colon:

\[ 5:36 \]

Therefore, the scale factor used in the drawing is:

\[ \boxed{5:36} \]