Final answer:
Without additional data on the total or percentage preference for hamburgers, it's impossible to determine how many preferred hamburgers over pizza. However, we can find the fraction and percent of veggie-burgers consumed in a university cafeteria and the number of adults who believe in alien visits using percentages and scientific notation.
Step-by-step explanation:
The question requires a mathematical understanding to do a comparison or to identify a proportion of two quantities. Unfortunately, the information provided does not specify the total number of people or the relation between the number of people who preferred pizza and those who preferred hamburgers. Therefore, without additional information on the total number of people surveyed or the percentage that preferred hamburgers, we cannot determine the number of people who preferred hamburgers based solely on the number of people who preferred pizza (540). It is like knowing only one part of a puzzle -- without the rest of the pieces or a clearer picture, we cannot accurately complete the image.
Moving on to the reference information provided: To calculate the fraction and percent of veggie-burgers consumed at the cafeteria, divide the number of veggie-burgers (997) by the total number of burgers (889,875). This gives us a fraction of 997/889,875, which can be simplified as needed. To find the percentage, convert the fraction to a decimal and then multiply by 100. For the Kelton Research poll, to determine the number of adults who believe in alien visits, simply calculate 36 percent of the adult population in scientific notation. This entails converting the percentage to a decimal (0.36) and multiplying it by the population number (222,000,000) in scientific notation.