In a parking lot of 240 red and blue cars, the ratio of red cars to blue cars is 3 : 5 . how many red cars are in the parking lot?

So given there are 240 cars

3:5 ratio or red to blue 

3+5 = 8 

red cars 3/8 *240 = 90

blue cars 5/8 * 240 =150

ratio of red to blue 90:50 

simplify 
90 divided by 30 = 3 
150 divided by 30 = 5 

90:150 = 3:5

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