SSAT Math Question 330: Answer and Explanation

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Question: 330

9. In a survey, each of 300 people watches TV through cable, video streaming apps, or both. If 270 of these people have cable and 90 have video streaming apps, how many people have both cable and video streaming apps?

A. 30
B. 60
C. 90
D. 180

Correct Answer: B

Explanation:

The answer is B

If 270 people have cable and 90 people are video streaming, that would mean there are 360 people. However, there are only 300 people, which means 60 of those people were counted twice.

It is useful to use the following formula in these types of questions: G₁ + G₂ + N - B = T. This stands for Group 1 + Group 2 + Neither - Both = Total. Here, as there is no N, the completed formula is 270 + 90 - B = 300. Solve for B: 60.

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