In a survey, adults were asked to answer yes or no to the question Do you regularly

Question:

In a survey, adults were asked to answer yes or no to the question ‘Do you regularly watch the evening TV news?’ Some of the results from the survey are detailed in the Venn diagram opposite.

One adult is selected at random and it is found that the events ‘a female is selected’ and ‘a person who regularly watches the evening TV news is selected’ are independent. Find the number of adults questioned in the survey.

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