How to find the common part with a Venn Diagram Practice Test - ISEE Lower Level Quantitative Reasoning

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Aracely posted a survey question using one of her social network accounts. She grouped the results into three categories. The response results are represented by the Venn diagram shown above.

Group $\small A$ represents the respondents that answered "yes" to the survey question. Group $\small B$ represents the respondents that answered "no" to the survey question. And, the overlapping part of the diagram represents the respondents that answered "maybe" to the survey question.

What percentage of the respondents answered "maybe" to Aracely's survey question?

Students were asked if they prefer TV or radio. The following Venn Diagram depicts the number of students who said TV, radio, or both. How many students like both TV and radio?

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