GreenlightTestPrep wrote:
Each new car produced in a certain factory includes at least one of the following three options: Bluetooth, navigation system, and sunroof. Of the cars that came off the production line yesterday, 25 had Bluetooth, 13 had a navigation system, and 30 had a sunroof. Yesterday, 50 cars were completed. Which of the following could be true about the cars that came off the production line yesterday?
Indicate all possible answers.
A) There were 2 cars that had exactly two of the options and there were 8 cars that had all three options.
B) There were 3 cars that had exactly two of the options and there were 7 cars that had all three options.
C) There were 4 cars that had exactly two of the options and there were 7 cars that had all three options.
D) There were 6 cars that had exactly two of the options and there were 6 cars that had all three options.
E) There were 7 cars that had exactly two of the options and there were 5 cars that had all three options.
F) There were 8 cars that had exactly two of the options and there were 4 cars that had all three options.
This is a 3-criteria overlapping sets question.
So, we can sketch the given information as follows:
Let's start with answer choice A.
If 2 cars had exactly 2 of the options, and 8 cars had all three options, then we can add this information as follows:
ASIDE: It makes no difference which two overlapping options we use for the "2 cars had exactly 2 of the options" part.
In the above diagram, I've placed those two cars in the navigation/sunroof overlap, but I could have also placed them in the navigation/Bluetooth overlap or in the sunroof/Bluetooth and still answer the question correctly. Since there are no other cars that have overlapping features, we can complete the rest of the diagram as follows:
Now that we've completed the diagram, we must ask, "HAVE WE ACCOUNTED FOR ALL 50 CARS?"
To find out, we must add all of the values in the diagram.
We get: 17 + 3 + 8 + 2 + 20 = 50
Perfect!
So,
answer choice A is possible Now follow the same steps for answer choice B to get:
HAVE WE ACCOUNTED FOR ALL 50 CARS?
Add all of the values in the diagram to get: 18 + 3 + 7 + 4 + 20 =
51No good!
Answer choice B is NOT possible For answer choice C, we get:
Add values: 18 + 2 + 7 + 4 + 19 = 50
Perfect!
So,
answer choice C is possible For answer choice D, we get:
Add values: 19 + 1 + 6 + 6 + 18 = 50
Perfect!
So,
answer choice D is possible For answer choice E, we get:
Add all of the values in the diagram to get: 21 + 1 + 5 + 7 + 18 =
53No good!
Answer choice E is NOT possibleFor answer choice F, we get:
Add all of the values in the diagram to get: 21 + 1 + 4 + 8 + 18 =
52No good!
Answer choice F is NOT possibleAnswer: A, C, D
Cheers,
Brent
17 Aug 2019, 05:50
53% (02:57) correct
