The scale used on the map is 1 cm : 50 miles. If the distance between Atlanta and Augusta is 150 miles, how many cm apart are the cities on the map?

1/50= 3/150 because 3*50=150

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When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.