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?

SmartMathMan Jan 11, 2018

#1**+1 **

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

CPhill Jan 11, 2018