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The scale that Chad used in the scale drawing is 1 inch: 9 feet
A ratio is a quantitative relationship between two different numbers that express the number of times in which a number is divisible within the other number.
In the ratio of an inch to feet; the scale that Chad used is:
= 1 inch : 9 feet
This is because 9 inches is divisible within the other number (i.e. 81 feet) in 9 times.
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