The history museum is hosting a special exhibition on history of flight. The admission ticket for each adult costs $5 and the admission ticket for each child costs $2. On the opening day of the exhibition, 50 tickets were sold for a total of $230. How many adults visited the special exhibition?

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Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list