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There are 30 cars in my building's parking lot. All of the cars are red or white, and a car can have either 2 doors or 4 doors. 1/3 of them are red, 50% of them are 4-door, and 8 of them are 2-door and white. How many of the cars are 4-door and red?

 Jan 11, 2018
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There are 30 cars in my building's parking lot. All of the cars are red or white, and a car can have either 2 doors or 4 doors. 1/3 of them are red, 50% of them are 4-door, and 8 of them are 2-door and white. How many of the cars are 4-door and red?

 

10  are red.....so .....20 are white

15 are 4-door......so....15 are 2-door

 

8 are 2-door and white.....so.....12 must be 4-door and white since there are 20 white in total 

 

But......15 are 4-door....and 12 of these  are white....so.....

 

That must mean that  3 others are  4-door and red  

 

 

cool cool cool

 Jan 11, 2018

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