Julie measured a swimming pool and made a scale drawing. In real life, the diving board is 20 feet long. It is 36 inches long in the drawing. What scale did Julie use?
9 inches : feet
To find the scale, we need to find the ratio between the length of the diving board in the drawing and the length of the diving board in real life.
Since the diving board in the drawing is 36 inches long and in real life it is 20 feet long, we can set up a proportion:
36 inches / 20 feet = x inches / 1 foot
Simplifying the proportion:
36/20 = x/1
Cross multiplying:
36 = 20x
Dividing both sides by 20:
36/20 = x
x = 1.8
Therefore, the scale Julie used is 9 inches : 1 foot or 1.8 inches : 1 foot