Question

There are 20 cars in my building's parking lot. All of the cars are red or white. Also, all the cars are either 2-door or 4-door. 12 of them are red, 15 of them are 4-door, and 4 of them are 2-door and white. How many of the cars are 4-door and red?

Answer 1

(1/3) are red = 30 *1/3 = 10 are red

So...20 are white

50% are 4 door = 15 are 4 door

So....15 are 2 door

8 are 2 door and white.....so 12 are 4 door and white since we have 20 white total

And since 15 are 4 door and 12 of these are white...then 3 must be 4 door and red

ORRRR

Make a two-way table as follows:

RED WHITE

2-DOOR 7 8

4-DOOR 3 12

TOTALS 10 20

So, it looks like you have 3 cars that are red and have 4 doors.

Answer 2

11 cars

Explanation:

There are 20 cars in my building's parking lot, 15 cars are 4-door, then

`20-15=5` cars are 2-door.

5 cars are 2-door, 4 of them are 2-door and white, then

`5-4=1` car is 2-door and red.

12 cars are red, 1 car is 2-door and red, then

`12-1=11` cars are 4-door and red.